The Star That Can't Exist

Ғылым және технология

Visit our sponsor, Brilliant.org: brilliant.org/CoolWorlds
The cosmos is littered with blue and red stars... but curiously no green ones. Why? Is this a fundamental constraint or merely an unlikely outcome? And what would it mean for humanity if we ever did detect a green star? Join us today as we explore this simple question with major implications.
Written & presented by Prof David Kipping
→ Support our research program: www.coolworldslab.com/support
→ Get Stash here! teespring.com/stores/cool-wor...
THANK-YOU to our supporters D. Smith, M. Sloan, L. Sanborn, C. Bottaccini, D. Daughaday,A. Jones, S. Brownlee, G. Fulton, N. Kildal, M. Lijoi, Z. Star, E. West, T. Zanjonc, C. Wolfred, F. Rebolledo, L. Skov, E. Wilson, A. de Vaal, M. Elliott, B. Daniluk, M. Forbes, S. Vystoropskyi, S. Lee, Z. Danielson, C. Fitzgerald, V. Alexandrov, L. Macchia, C. Souter, M. Gillette, T. Jeffcoat, H. Jensen, F. Linker, J. Rockett, N. Fredrickson, B. Mlazgar, D. Holland, J. Alexander, E. Hanway, J. Molnar, D. Murphree, S. Hannum, T. Donkin, K. Myers, A. Schoen, K. Dabrowski, J. Black, R. Ramezankhani, J. Armstrong, K. Weber, S. Marks, L. Robinson, F. van Exter, S. Roulier, M. Hammer, J. Swigo & A. Murphy.
::Music::
Music licensed via Creative Commons (CC) Attribution License (creativecommons.org/licenses/...)
► Brad Hill - Of Love and Loss [open.spotify.com/album/2oDAnU...]
► Joachim Heinrich - Cassiopeia
► Falls - Life in Binary
► Chris Zabriskie - Cylinder Five
► Falls - Ripley
► Indive - Trace Correction
::Film/TV clips used::
► Contact (1997) - Warner Bros. Pictures
► Avengers: Endgame (2019) - Walt Disney Studios Motion Pictures
::Chapters::
00:00 Prologue
00:59 The Dearth of Green Stars
05:25 Sponsorship
06:28 The Blackbody Approximation
10:51 Entering the Multiverse
13:04 The Viridian Flash
14:46 A Green Technosignature
18:37 Concluding Remarks
19:27 Outro and credits
#NoGreenStars #Technosignatures #CoolWorlds

Пікірлер: 2 500

  • @CoolWorldsLab
    @CoolWorldsLab2 жыл бұрын

    Thanks so much for checking out our video, and thanks to our sponsor - head to www.Brilliant.org/CoolWorlds to learn more. Do you think civilizations might engineer the very stars themselves like this? Let us know down below, along with any other topics you'd like us to cover in the future.

  • @rbolo29

    @rbolo29

    2 жыл бұрын

    IF enough copper could be added to the photosphere, would it radiate a greenish color? We live in a infinite universe, but our minds are infinite too. I'm sure it could be made, given enough resources?

  • @comicbookcollector1699

    @comicbookcollector1699

    2 жыл бұрын

    Is there a way of artificially altering a star to become green? Maybe through adding an extra element? Removing an element? etc

  • @Meowww_notttvcat

    @Meowww_notttvcat

    2 жыл бұрын

    Thanks so much .Thought experiments make physics more accessible to everyone.

  • @larryl3416

    @larryl3416

    2 жыл бұрын

    We would have to be a type 3 civilization to manipulate/engineer stars. Don't you think? But who knows what we might be capable of in the far future.

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Copper sulphate burns green but that would dissociate in a star!

  • @viciousyeen6644
    @viciousyeen66442 жыл бұрын

    There’s a really rare possibility for a single green star to spawn in the game Stellaris. There’s even a dedicated mention by the science vessel that finds it, calling it an impossible anomaly

  • @coryhermus5872

    @coryhermus5872

    2 жыл бұрын

    Love me some Stellaris, excelent easter eggs

  • @ThaDarkSideBlues

    @ThaDarkSideBlues

    2 жыл бұрын

    Stellaris is such a great game!

  • @Gamingclutch1993

    @Gamingclutch1993

    2 жыл бұрын

    Diplomatic alert 🚨 war protocols initiated

  • @dantyler6907

    @dantyler6907

    2 жыл бұрын

    A game? This is a solid science video and some folks chime in with games?

  • @BierBart12

    @BierBart12

    2 жыл бұрын

    @@dantyler6907 A game made by absolute science nerds, yes

  • @architectofdreams73
    @architectofdreams732 жыл бұрын

    The moment when a human being says something can't exist naturally, that's when the universe is like, "challenge accepted"

  • @slevinchannel7589

    @slevinchannel7589

    2 жыл бұрын

    Call me silly/random, but i just want to do my fellow Science-Lovers a Favor, so excuse the Randomness but here you go, have some warm Recommendations, cause the Learning never Ends! -Veritasium. -Oversimplified! -It’s ok to be smart. -Professor Dave Explains. -Practical Engineering -Michio Kaku. -Kosmo. -Legal Eagle. -Cinema Therapy. -And the arguably Best for Last: Hbomberguy! (The best at being Unbiased on all of YT.)

  • @emiliofernandez7117

    @emiliofernandez7117

    2 жыл бұрын

    @@slevinchannel7589 merci

  • @albledsoe8080

    @albledsoe8080

    2 жыл бұрын

    THANK YOU!!

  • @laurenceharper2037

    @laurenceharper2037

    2 жыл бұрын

    @@slevinchannel7589 Hbomberguy is lame.

  • @slevinchannel7589

    @slevinchannel7589

    2 жыл бұрын

    @My names Jeff Lol, what? I dont think he ever mentioned Religion on his history-channel? The fluff? Are we talking about the same channel, even? ??

  • @NikB8989
    @NikB89892 жыл бұрын

    If I had a science teacher that came close to having as much enthusiasm as you I'd be a physicist today. Teachers should all teach like this. They should inspire a sense of wonder and deep thought. Keep up the great videos!

  • @kelly8431

    @kelly8431

    2 жыл бұрын

    Then go be a teacher… talk Is cheap

  • @gravoc857

    @gravoc857

    2 жыл бұрын

    @@kelly8431 Nah. Society is brutal on teachers. Who wants to handle that?

  • @NikB8989

    @NikB8989

    2 жыл бұрын

    @@kelly8431 Yeah.. except I was only exploring a theoretical possibility that was completely separate from this reality. Fact is at 30 years old I don't think a career change with a pay cut would make much sense. Hence what I said. Unless you might have a time machine I could borrow?

  • @thegamesforreal1673

    @thegamesforreal1673

    2 жыл бұрын

    Teacher in Training here. Sadly, in most modern societies, education simply doesn't have much time for this kind of in-depth analysis, speculation and discussion... I would LOVE to dedicate whole lessons to sidetracks like this, but the truth is, the curriculum is too overloaded to do so. I would be a BIG fan of cutting the curriculum down, trimming the fat so to say, so teachers have more time to discuss other interesting phenomena in class.

  • @firstconsul7286

    @firstconsul7286

    2 жыл бұрын

    @@thegamesforreal1673 This is a part of why, despite being super interested in military history, and that I love explaining and showing that history to others, I don't want to be a teacher per se. Ironically, it is also a huge part of why I am such a history nerd, because my teachers would touch on subjects like Napoleon or Caesar, and I, wanting to know more, explore the internet for as much info as I can.

  • @timdunk7278
    @timdunk72782 жыл бұрын

    Prof Kipping... Your story writing, narration and presentations are a magical gift of education to the public. Sincere gratitude to you sir.

  • @jessepinkman5624
    @jessepinkman56242 жыл бұрын

    I'm an art student and have never been very science savvy, but there's something about the content here that genuinely makes me want to learn. Thank you professor Kipping and team, you guys are fantastic communicators.

  • @yz250ftony

    @yz250ftony

    2 жыл бұрын

    Considering you failed chemistry, art might be a better option

  • @fjames208

    @fjames208

    2 жыл бұрын

    Snd u might never will🙈🦧🙉

  • @UUGamez

    @UUGamez

    2 жыл бұрын

    @@yz250ftony Except yellow is one of the primary colors, not green, an art student should've noticed that. I'm surprised no one noticed that, maybe I'm the idiot here.

  • @bernardshrewsbury

    @bernardshrewsbury

    2 жыл бұрын

    Given the fact that science is a part of everything, including art

  • @hairglowingkyle4572

    @hairglowingkyle4572

    2 жыл бұрын

    @@yz250ftony tbf he got better at it, kinda

  • @nobiggeridiot
    @nobiggeridiot2 жыл бұрын

    Somewhere Kermit is sadly singing 'It's not easy being green'.

  • @simoklownz2267

    @simoklownz2267

    2 жыл бұрын

    And the uk prime minister quoted him in a un conference... That is the definition of sad...

  • @garyschasteen9440
    @garyschasteen94402 жыл бұрын

    I really enjoyed this one! One thought when you had asked why an alien civilization might want to create a green star was that it might be useful as a light-house, a way to identify which star is 'home'. If a civilization could create such a megastructure, it might also be able to travel far from their home star, in which case, having a stable and easy way to pin-point where they are, and the way back, might be worth the investment for them. Maybe other techno-signatures exist that are easier, and cheaper to create. What's the cheapest and easiest one to create?

  • @thedarkdragon1437

    @thedarkdragon1437

    2 жыл бұрын

    radiowave. you need to ask another question: What's the cheapest and easiest usable one to create?

  • @ztevie.j

    @ztevie.j

    Жыл бұрын

    Well, a civilization so advanced it can create a green star will probably have the technology to navigate in space without the need of "lighthouses" to show them where they are?

  • @kalakritistudios

    @kalakritistudios

    Жыл бұрын

    @@ztevie.j One day if their technology shrinks because of war or so. In Stories their Star could be passed down. The smart civilization must have taken that possibility into considerance.

  • @carsonmalleet4367

    @carsonmalleet4367

    Жыл бұрын

    Such a cool thing to think about. I love the comment sections of these videos almost as much as the videos themselves.

  • @Stargazzer811

    @Stargazzer811

    Жыл бұрын

    QEC beacons. Use quantum entanglement to punch a hole through space faster than light and send a single through that is picked up by something as simple as a radio. Not cheap or easy to create, but a civilization that can master quantum entanglement can probably afford to create thousands easily.

  • @will2brown50
    @will2brown502 жыл бұрын

    Excellent video greatly enjoyed. I'm aware that purple/violet stars are highly unlikely due to both the extreme heats required, alongside the weakness in the human eye in seeing the violet spectrum, although it would be interesting to see if a ridiculously hot star could produce that colour.

  • @kennycarter5682

    @kennycarter5682

    2 жыл бұрын

    I agree!

  • @paavobergmann4920

    @paavobergmann4920

    Жыл бұрын

    I wonder if a young neutron star could look violet, if you were close enough to look past the glaring jets and whatnot. But then again, you probably wouldn´t want to be that close to a neutron star. It´d probably fry you.

  • @louisgiokas2206
    @louisgiokas22062 жыл бұрын

    Actually, green can be quite nauseating. Once worked on a simulator. In testing the displays, we had people sit in front of a display as it was cycled through all the color combinations. Green actually made people feel nauseous. Now, in nature, we tend to like green. This is an interesting situation. Perhaps the green on the display was more intense and "pure". Don't really know.

  • @Zorro9129

    @Zorro9129

    2 жыл бұрын

    Well, people do turn green when nauseous.

  • @SayAhh

    @SayAhh

    2 жыл бұрын

    Eva Green is a star ;)

  • @Biden_is_demented

    @Biden_is_demented

    2 жыл бұрын

    Green stars exist. Hollywood is filled to the brim with them. They´re the dying stars feeling jealous of all others...

  • @thoththeatlantean1226

    @thoththeatlantean1226

    2 жыл бұрын

    because the green on your screen is so artifically fake compared to the real thing that it makes you nauseaus

  • @1988mib

    @1988mib

    2 жыл бұрын

    Maybe green colour is not the problem, but with brightness added it could be.

  • @paulohenrique_bitencourt
    @paulohenrique_bitencourt2 жыл бұрын

    Learning about space, is what makes me smile, and Cool Worlds have the best ones.

  • @pomskylifenova7344

    @pomskylifenova7344

    2 жыл бұрын

    I agree

  • @gabrielecoco5588

    @gabrielecoco5588

    2 жыл бұрын

    Try melodysheep

  • @Will-me8zw

    @Will-me8zw

    2 жыл бұрын

    Agreed. If I'm stressed I listen to one of these videos. Chill voices and smart info!

  • @Will-me8zw

    @Will-me8zw

    2 жыл бұрын

    @@gabrielecoco5588 melody sheep is awesome!

  • @christinebernchat7125

    @christinebernchat7125

    2 жыл бұрын

    Came here because Cool Worlds is the best. Left super happy to have discovered Melodysheep.

  • @thesaladballs
    @thesaladballs2 жыл бұрын

    currently astrophysics is just a hobby for me. i work a day job (or technically a night job) for now until i can put back enough money to run myself through college. but i have taken up brilliant’s astro course and i’m loving it so far. this channel is just adding gasoline to the flame that is my passion for astronomy, and i’m excited to take it somewhere. and truly, thank you david, for putting all this out here for free. it truly is better than you know to folks like me. you’re truly an inspiration, and i can’t wait to get there myself!

  • @merakbear890
    @merakbear8902 жыл бұрын

    See, this is why I love your channel so much, Prof. Kipping! You're out here answering questions I didn't even realize I had. Every video you upload takes me on such a journey

  • @slevinchannel7589

    @slevinchannel7589

    2 жыл бұрын

    Call me silly/random, but i just want to do my fellow Science-Lovers a Favor, so excuse the Randomness but here you go, have some warm Recommendations, cause the Learning never Ends! -Veritasium. -Oversimplified! -It’s ok to be smart. -Professor Dave Explains. -Krimson Rogue. -Practical Engineering -Michio Kaku. -Kosmo. -Legal Eagle. -Cinema Therapy. -And the arguably Best for Last: Hbomberguy! (The best at being Unbiased on all of YT.)

  • @maverickdisco4036
    @maverickdisco40362 жыл бұрын

    Fascinating, being a former seafarer the “green flash” was often talked about. Now I understand it. Thank you.

  • @paulkazjack

    @paulkazjack

    2 жыл бұрын

    Ive seen it too.

  • @p39483

    @p39483

    2 жыл бұрын

    I've seen it from about 100 ft above the water on a cruise ship. Yet I fly often and in the many sunsets I've seen from altitude, often over land, I've never seen the flash there. I've also never seen it from the surface looking out at the water. I believe height has something to do with it.

  • @jamesgeary4294
    @jamesgeary42942 жыл бұрын

    This technosignature was featured in Ken MacLeod's novel Learning the World, where humanity has cloaked so many stars in swarms of green habitats that to alien observers, they appear green and more and more do so as humanity's bubble expands.

  • @ColinBache

    @ColinBache

    2 жыл бұрын

    Thanks for the recommendation! Just started reading the sample and it looks epic 👍

  • @EdricLysharae

    @EdricLysharae

    2 жыл бұрын

    Same thing with Alistair Reynold's Galactic North, but the situation there is far more dire!

  • @Zorro9129

    @Zorro9129

    2 жыл бұрын

    Any relation to Kevin MacLeod?

  • @MyMarsham

    @MyMarsham

    2 жыл бұрын

    Also alluded to in several of Stephen Baxter’s books, most notably “Time.”

  • @ColinBache

    @ColinBache

    2 жыл бұрын

    Loving the sci fi recommendations! 👍🙏❤️

  • @Jieeimuzu
    @Jieeimuzu2 жыл бұрын

    Saw this video in the suggestions last night, added it for my watch later to catch today. The quality of the content alone give me no choice other than to subscribe. KZreadrs like you are rare, so worth to keep an eye on! Keep up the brilliant work! :)

  • @braddblk
    @braddblk2 жыл бұрын

    I read sci-fi books called the Skylark series in high school written by E.E. Smith. The first was written in 1928, in it the total release of energy was accomplished by a catalyst painted on a metal and then given an electrical charge. They then used it to travel to other stars including green ones. Green because they were high in copper. Since copper burns green this made perfect sense to me then. In all the years since I hadn't thought of those books until now. Your explanation of the color of stars solidified knowledge I had but didn't put together and understood. Your channel is the kind of source that I tell my grandchildren about as an example to never stop searching for knowledge.

  • @lawenda2099
    @lawenda20992 жыл бұрын

    Let's take a moment to appreciate that David gives us this amazing quality content for FREE.

  • @cjmacq-vg8um

    @cjmacq-vg8um

    2 жыл бұрын

    ... what, do you think they should charge us for it like some two-bit, profiteering corporation? the thing about information and facts is that they're supposed to be shared freely and without expectation of personal profit. that's what i do. being that this is rare these days, i too agree with you. i thank this channel for its lack of commercialism. but they do fund this channel through t-shirt sales and, i'm sure, other products. but i can live with that. as long as they don't force commercials on me like so many other youtube channels do.

  • @cjmacq-vg8um

    @cjmacq-vg8um

    2 жыл бұрын

    @@taylorbrock4635 ... uuhhh, ya, there is. they can profit all they want but they have no right to STEAL my money. they can steal your money instead. but guess what. it doesn't work that way does it? when gullible, pro-corporate automatons like you allow the oligarchs to steal from you; you're allowing them to steal from me. actions have consequences and the consequenses of your gullible apathy is that I AM HARMED! and i don't appreciate that.

  • @darrenasquith1170

    @darrenasquith1170

    2 жыл бұрын

    Nothing is free

  • @cjmacq-vg8um

    @cjmacq-vg8um

    2 жыл бұрын

    @@darrenasquith1170 ... nothing is free under capitalism. yet, nothing costs anything in nature. go figure.

  • @bazonga9085

    @bazonga9085

    2 жыл бұрын

    @@cjmacq-vg8um no shit? Lol what a fucking obvious statement to make.

  • @arnavsolanki5193
    @arnavsolanki51932 жыл бұрын

    Honestly you're an inspiration. Can't wait until I finish my own PhD and run a side youtube channel for informational videos and podcasts as a professor! Cheers!

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Hey you don’t need to wait until you finish your PhD!

  • @arnavsolanki5193

    @arnavsolanki5193

    2 жыл бұрын

    @@CoolWorldsLab that is true, and ideally I begin now instead of leaving it for the future. But right now it's a lot of work writing papers and taking courses, and I think it's better if I prioritize my degree. Either ways, this was an intriguing video, love your content!

  • @sumdumbmick

    @sumdumbmick

    2 жыл бұрын

    yes, boring jabberman is so insire. let's all go take out loans to avoid having a real job so we can be grad students!

  • @skatemaster33

    @skatemaster33

    2 жыл бұрын

    @@sumdumbmick What are you saying, being a proffesor isn't a real job? I'm not a student but getting a PhD is not easy lol, why are you assuming these people are "lazy"...

  • @suzannebrown2505

    @suzannebrown2505

    2 жыл бұрын

    To Mick: Perhaps you are not aware that many doctoral students DO work to help them to survive and achieve their goals, whenever they can. Some can get teaching assistant positions, grants, or any type of part-time job(s) to help financially, or maybe a small loan to help. People who can even qualify for acceptance into their program of choice must be able to qualify. This means having high intelligence, undergraduate courses in their field, some experience, exams, and sufficient basic knowledge to qualify for the difficult road to success. With little spare time for relaxation or social activities, or even enough sleep, theirs is not a pursuit to be taken lightly. For several years, plus a published dissertation, they will literally work “their butts off” for their advanced doctoral degree!

  • @Jacen13
    @Jacen132 жыл бұрын

    I work with a lot of people. Rarely do I come across a coworker that shares the same passion for the cosmos as I do. My love for astronomy started when I was a child. I loved NASA, our Solar System & using my imagination. Today I got to discuss the upcoming James Webb telescope with a coworker. I love talking about space as it really is the final frontier! 🔭🪐☄️🛰🌎🌒☀️🪐🌌

  • @stephanieparker1250
    @stephanieparker1250 Жыл бұрын

    I’m so in love with this channel. Astronomy and philosophy combined perfectly.

  • @Sinister_Ball

    @Sinister_Ball

    Жыл бұрын

    Both go hand in hand.

  • @MadderMel
    @MadderMel2 жыл бұрын

    Lots to love about Cool Worlds ! But for me it's the genuine humility shown by David , and the utmost respect he shows to his listeners ! One of the very best KZread channels ! P.S. That's not to mention the very high quality and creative standards he shows in his professional career ! Thinkers like David are much needed !

  • @slevinchannel7589

    @slevinchannel7589

    2 жыл бұрын

    Call me silly/random, but i just want to do my fellow Science-Lovers a Favor, so excuse the Randomness but here you go, have some warm Recommendations, cause the Learning never Ends! -Veritasium. -Oversimplified! -It’s ok to be smart. -Professor Dave Explains. -Krimson Rogue. -Practical Engineering -Michio Kaku. -Kosmo. -Legal Eagle. -Cinema Therapy. -And the arguably Best for Last: Hbomberguy! (The best at being Unbiased on all of YT.)

  • @ggabbay0
    @ggabbay02 жыл бұрын

    The path down the color wheel (as temp goes up) was brilliant. Thanks!

  • @suzleber4
    @suzleber42 жыл бұрын

    New sub, glad this popped up as a suggested space video. The temperature vs color wheel was really interesting and although I can't do those formulas I understood by the shifting of the graph that green would be close or impossible to achieve. Thanks for the content! Great job!

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Welcome to Cool Worlds

  • @luiscalcada
    @luiscalcada2 жыл бұрын

    Really appreciate that you take the time to credit all the videos we produce at ESO. And thank you for the great content.

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Hi Luis! It’s great to see you on the channel! Let me extend a sincere thank you for the wonderful graphics you produce which we have often used! They’re beautiful and inspiring and we love sharing them.

  • @luiscalcada

    @luiscalcada

    2 жыл бұрын

    @@CoolWorldsLab the feeling is mutual. We're happy to see the science and the videos we produce popularized by amazing channels like yours! Keep them coming!

  • @CoolWorldsLab
    @CoolWorldsLab2 жыл бұрын

    Answering a couple of common questions! 1) Could a high velocity blue star get redshifted to appear green? No. If you take the relativistic Planck function from Lee & Cleaver 2015 (arxiv.org/abs/1507.06663) you can see this. For example, take an O3 blue dwarf of ~45,000K. To redshift enough so that it peaks in green, we need a speed of 0.97c receding. But, the resulting shifted Planck function *precisely* overlaps with the Planck function of a star at rest which peaks in green. So it looks just like a Sun-like star in color! 2) What about purple stars or other weird colors? Yes indeed a technosignature could really be any spectral function with no natural explanation. More broadly, one would look for unnatural combinations of bandpass colors (e.g. green star would appear via excess G-band magnitude). A Dyson sphere/swarm is a specific case of this, producing excess infrared flux. 3) Color perception? This video is made for humans (!), so by "green" I mean what we call "green". I can't really speculate about what an alien calls green, or really if that question makes that much sense to be honest.

  • @michaelking9818

    @michaelking9818

    2 жыл бұрын

    Just what I was thinking

  • @getsideways7257

    @getsideways7257

    2 жыл бұрын

    I'm not quite sure, but are there any other species even here on Earth, which perceivable EM spectrum overlaps with that of humans? We might as well try looking for 10 nm bandwidth red star or a blue star... or in the X-ray band for that matter. The problem here is not the "absence of green stars". Nature DOES NOT KNOW of "green" in the first place. Not to mention that for some species / AI that's actually a pretty narrow band, so they see stars in "all colors" just fine. No need to be so human-centric. So yes, "a techno signature could really be any spectral function with no natural explanation", and I believe it is VERY important to make that clear if not in the video itself, then at least in its description - not in some comment down below that nobody is going to find / read anyway.

  • @josephcoon5809

    @josephcoon5809

    2 жыл бұрын

    Technically, “green” is a metaphysical perception, not a physical reality. Light exists; colors do not. In that vein, it comes down to altering how the prefrontal cortex codes electrochemical signals coming from your photoreceptors.

  • @getsideways7257

    @getsideways7257

    2 жыл бұрын

    @@josephcoon5809 In that vein, "light" also doesn't exist. There is no particular reason to isolate this very narrow EM band.

  • @josephcoon5809

    @josephcoon5809

    2 жыл бұрын

    No. light is a physical entity; color is a symbolic language. Light ceases to exist at the retina and becomes a cascade of electrochemical reactions until it is processed as color in the prefrontal cortex. Sensory neurons are the demarcation between reality and virtualization. The reason to isolate this particular range is because that’s where most of the radiance occurs. Plants absorb two wavelengths of “blue” and two “red” for the most part to break the two bonds in CO2 and H2O. This would leave other wavelengths for visual cue usage.

  • @jmanj3917
    @jmanj39172 жыл бұрын

    Another great episode.. Dr. Kipping's passion for the subject matter is obvious, and he has what it takes to convey his knowledge in an effective, and interesting, way. Thanks, Doc!

  • @LockandKeyHyena
    @LockandKeyHyena2 жыл бұрын

    your explanations and delivery is incredibly interesting and relaxing!! definetly subbing

  • @ms-ds3wv
    @ms-ds3wv2 жыл бұрын

    Exceptionally good and high quality video. This lecture blew my mind to bits. I need some time to recover and digest after this one.

  • @telejeff
    @telejeff2 жыл бұрын

    thanks for the fun and informative video. My only disagreement is with the claim that the physics of light says that colors are made from the primary additive colors, RGB. Visible light and RGB are determined and explained by human biology and our RGB retinal cones, not some property of pure physics like the blackbody radiation curve. I was always disappointed that science classes and physics books rarely explain this when they explain the “primary” colors.

  • @rogermateer2466

    @rogermateer2466

    2 жыл бұрын

    Exactly. The universe we see is highly specific to the (typical) human visual apparatus. The universe doesn't have anything against green, per se, but simply against having too sharply defined a blackbody emission spectrum. If we happened not to have red retinal cone cells, but had ones sensitive to ultraviolet instead, then cool stars would appear "green" to us, hot stars would appear "ultraviolet" to us (barring atmospheric filtering, of couse), and blue stars would be "impossible". Or, if we happened not to have blue retinal cone cells, but had ones sensitive to infrared instead, then hot stars would appear "green" to us, cool stars would appear "infrared" and red stars would be "impossible". Of course, equipped with such alternative sets of visual apparatus, who knows what the subjective experience would be like. Who knows, in fact, whether different people with the same visual apparatus even have the same subjective experience. The point is, in order to explain objective scientific concepts in a clear and engaging way, we sometimes need to appeal to people's subjective experiences, and it isn't always explicit that this is being done.

  • @shaquadradeloiserussell8659

    @shaquadradeloiserussell8659

    2 жыл бұрын

    The primary colors are red , yellow , blue. Green comes next with orange.

  • @theslay66

    @theslay66

    2 жыл бұрын

    @@shaquadradeloiserussell8659 wrong. These are primary colors for pigments, which absorbs part of the wavelenghts. Used in printing and painting, they are actually cyan, magenta, yellow, black (and white for painting). Pigment colors are substractive, that's why you will never be able to get white by mixing C M and Y (you could theorically get black by mixing them, but in practice pigment absorption is imperfect so you get some kind of dark grey instead). However concerning light itself, primary colors are red, green and blue. Light colors are additive, that's why you can get white by mixing them (that how your TV/monitor works)

  • @shaquadradeloiserussell8659

    @shaquadradeloiserussell8659

    2 жыл бұрын

    @@theslay66 you cannot get black by mixing them. "Black" as far as 'colors' go, Has always been a very deep version of purple or red. Wash brand new black curtains and watch the dye flood the washer. Even when pure prismatic white light is refracted, it stil gives way initially to red , yellow , and blue. You CAN NOT have green without blue and yellow.

  • @theslay66

    @theslay66

    2 жыл бұрын

    @@shaquadradeloiserussell8659 Again, you can't have green without blue and yellow because of the substractive nature of pigments. Let's take the CYAN pigment. Under a white light (so a balance of Red+Green+Blue light), the cyan pigment absorbs the Red light, diffusing only Blue+Green, which gives the cyan color. Now let's look at the YELLOW pigment. It absorbs Blue light, and diffuses only Red+Green that we see as the yellow color. Then let's mix CYAN+YELLOW. You get a mixture that absorbs both Red and Blue light, and only diffuses Green light. So it appears to be green. See how it works ? The color of your pigments are an indirect result of them absorbing different wavelenghts of light. As far as black, in case you're wondering, it's just the absence of light. A black material looks black because it absorbs all wavelenghts, whereas a white material will reemit all of them. That's why during summer you'd avoid wearing black because it's hotter.

  • @NIL0S
    @NIL0S2 жыл бұрын

    I just discovered this channel and subscribed at the speed of light. Excellently edited, written and narrated. It's awe inspiring, not sensationalist. It gives a glimpse of the immense scales, not just cheaply bombastic. Thanks for making the stars reachable to our minds eye.

  • @stevencoardvenice

    @stevencoardvenice

    2 жыл бұрын

    Yeah I've been watching for almost 3 years. There's always an important point at the end of the videos

  • @HeezNeez
    @HeezNeez Жыл бұрын

    Yours is one of the rare channels where I can confidently give every video a preemptive like, and your narration also has a nice asmr quality as a bonus.

  • @MegaBrokenstar
    @MegaBrokenstar Жыл бұрын

    What makes Dr. Kipping’s videos so effective isn’t so much that it’s presented in an understandable way. Lots of science communicators can do that. The real key is that even though in videos like this he’s demonstrating the impossibility of something we’d all like to experience, he knows how to take care of our emotional intuitions well enough that we no longer feel as much intrinsic desire to subconsciously reject what he’s saying. Most people explaining why you can’t travel FTL sound like a parent explaining to a child that humans can’t fly. It’s intrinsically negative, and in that example ignores the emotional desire to fly anyway. Dr. Kipping subconsciously makes us open to understanding his concepts by stroking the desires they put out of reach. The other key is that he does a really good job of incrementally addressing all of our mental attempts to find workarounds.

  • @aclearlight
    @aclearlight2 жыл бұрын

    Lovely video as always, thank you! As a skywatcher's side note, I would point out that anyone with a modest telescope can readily enjoy the ILLUSION of seeing a green star by looking at one of the many "color separated" binary stars such as Gamma-Delpini, Gamma-Leporis or Eta-Persei...sounds terribly obscure, but it's actually quite easy to look up and find stars these days. All three of these offer up a lovely orange vs. "green" (-ish) appearance at the piece, with only the Gamma-Del one requiring much magnification to separate visually (about 80x). They are SO pretty to observe. Clear skies! 🌠

  • @SwedishFlyer
    @SwedishFlyer2 жыл бұрын

    Keep it up David, your work is amazing and inspiring.

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Cheers 👍

  • @michaelcherokee8906
    @michaelcherokee89062 жыл бұрын

    Thank you so much for marking the sponsorship as a chapter. Im probably taking more time to write this than the amount of time I skipped, but I dont even mind. Just for that, you get a like.

  • @mosselliadelt
    @mosselliadelt2 жыл бұрын

    Idk why this channel doesnt have more subs. Super interesting topics presented masterfully.

  • @obiwankenobi07
    @obiwankenobi072 жыл бұрын

    Literally best real science channel on KZread. Not even close 😍

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Means a lot to see comments like this 🤛

  • @MadderMel

    @MadderMel

    2 жыл бұрын

    I agree ! One of the best ! Scientific or otherwise !

  • @Laura-S196

    @Laura-S196

    2 жыл бұрын

    I agree.

  • @PaleBlueDot369
    @PaleBlueDot3692 жыл бұрын

    Amazing video!! I used to wonder a lot about existence of green stars in childhood. Feeling nostalgic right now 😄

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    It’s a beautiful question because it is indeed the sort of thing a child might wonder about the cosmos

  • @pomskylifenova7344

    @pomskylifenova7344

    2 жыл бұрын

    Super amazing.

  • @swainscheps
    @swainscheps12 күн бұрын

    I’ve always been interested in astronomy. One of my favorite classes in college was a stellar evolution class. And it has literally never crossed my mind that we don’t have green stars…cool video!

  • @staceygruver1969
    @staceygruver1969 Жыл бұрын

    Your commentary in the cool rules and other KZread channels that I’ve seen you in it’s very informative scientifically accurate ingeniously thought out in the storytelling and your voice has a calming learning tone to it resonates at least here in eastern United States. I hope to continue hearing and seeing your documentaries and further videos in the up-and-coming years. Good luck with any and all future endeavors

  • @hancholo1795
    @hancholo17952 жыл бұрын

    I entered the channel like 5 times this month to look for a new video and it just dropped - thank you, Universe 😂

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Thanks Lucian! Took a few weeks off to recharge but lots of ideas to come soon

  • @pomskylifenova7344

    @pomskylifenova7344

    2 жыл бұрын

    Yeah. I just looked and boom there it was. Lucky day

  • @hancholo1795

    @hancholo1795

    2 жыл бұрын

    @@CoolWorldsLab Always worth the wait. Awesome vid! Excited for the new stuff 🔭

  • @EVILJAMARR
    @EVILJAMARR2 жыл бұрын

    Look who just made my day? The professor returns!!!

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Haha happy to oblige!

  • @rob4758
    @rob47582 жыл бұрын

    Thank you for another excellent video and classy responses to questioners, even to those who could be a bit less presumptuous and more polite with their questions. I made a financial contribution to Cool Worlds for good reason. Wish you continued success and always looking forward to the next video.

  • @Luzitanium
    @Luzitanium2 жыл бұрын

    11:30 ahaha that meme of the brazilian actress never gets old XD I bet its the reflect of many of us when watching all those formulas. Love the content, just subscribed.

  • @RyanGazling
    @RyanGazling2 жыл бұрын

    I say "wow" at least once per video. Thank you!

  • @Deerugs
    @Deerugs2 жыл бұрын

    This video is powerful. In so many ways. I understand a lot of things that I’ve questioned previously. Thank you

  • @DanBennett
    @DanBennett Жыл бұрын

    This is the best explanation I have heard, ever!

  • @Ethan-fj2cn
    @Ethan-fj2cn Жыл бұрын

    This man is built like a tank, but has a soft and tender voice

  • @beatlejuice13
    @beatlejuice132 жыл бұрын

    This is actually really inspiring. Since I started following this channel a few years ago, I've invested in a low-end telescope (still expensive) and find myself looking up into the night sky late into the night. Big thanks to Professor Kipping and his colleagues 👏

  • @z-beeblebrox
    @z-beeblebrox2 жыл бұрын

    This is one of the best astronomy channels out there, it really deserves more attention! One thing I started thinking about when you mentioned the Green Flash effect - in our atmosphere, the Sun normally appears yellow despite being white, and I assume that's partly due to what comprises our atmosphere, and partly due to the angle of the Sun, and partly due to how thick our atmosphere is, and partly due to the light emitted by the Sun. Which is a *lot* more levers than just temperature, and it makes me wonder if you could fiddle with those combinations finely enough to make any color you wanted on a planet with an atmosphere...

  • @ukaraku8625

    @ukaraku8625

    2 жыл бұрын

    It's possible I assume, with some 'green filaments' being the filter color, it might just be.

  • @peNdantry

    @peNdantry

    2 жыл бұрын

    "in our atmosphere, the Sun normally appears yellow despite being white" -- I dispute that. I myself have never, ever, seen our Sun as 'yellow'. We're taught from childhood that 'the Sun is yellow', yet I defy you to actually look at it and see it as that colour. (a) During most of the day, you'd go blind trying that; (b) the only times you can comfortably look directly at the Sun are when it's shrouded in clouds (which are themselves white coloured, because the Sun is white, not yellow) and during sunrise and sunset -- when it appears *red* . Coupled with that is the reality that our eyes are actually incapable of seeing 'yellow' directly. I wrote a post on this not long ago: pendantry.wordpress.com/2021/06/29/is-it-actually-true-that-seeing-is-believing/

  • @z-beeblebrox

    @z-beeblebrox

    2 жыл бұрын

    @@peNdantry I've glanced at the Sun during the day before and it's always looked yellow to me *shrug* It's more of a morning and afternoon thing, if that's any help - at high noon it's probably about as close to white as it can get I imagine, but as it gets nearer the horizon (and further on the other side), there's a pretty substantial window of time where it transitions toward red by way of yellow. Certainly not by way of green that's for sure!

  • @peNdantry

    @peNdantry

    2 жыл бұрын

    @@z-beeblebrox If you believe that you've 'seen' a yellow Sun in the sky, you need to look again; I believe that you are mistaken. I've just been outside, and have seen the full moon. It is clearly white, without even a hint of yellow. Its light is reflected sunlight from the Sun. If the Sun were yellow, the moon would also be yellow... no?

  • @z-beeblebrox

    @z-beeblebrox

    2 жыл бұрын

    @@peNdantry No, because the sun is yellow due to Rayleigh scattering inside the earth's atmosphere, and the moon is in space, AWAY from the Earth's atmosphere. The only time the earth's atmosphere affects the moon is during a harvest moon, when the light from a sunset passes just by the edge of the earth and directly hits the moon, acting like a gel filter. Since light from the afternoon sun can't hit the moon without impossible angles, that's the only coloration the moon can receive, since in the vacuum of space the sun is white.

  • @brianzen1414
    @brianzen1414 Жыл бұрын

    New addict to your videos, most goes over my head, but I do learn a bit, enjoying listening to these vids while at work. Keep up the great work.

  • @420Khatz
    @420Khatz Жыл бұрын

    This is mind blowing-- I love your videos so much. You really think outside the box man.

  • @DJWHITE_
    @DJWHITE_2 жыл бұрын

    Can’t wait to tell my son about this tomorrow! It’s gonna blow his mind!

  • @andrew7955

    @andrew7955

    2 жыл бұрын

    Damn keep doing what you're doing, that's the best thing a dad can do. It's silly but I'm kind of tearing up a little

  • @DJWHITE_

    @DJWHITE_

    2 жыл бұрын

    @@andrew7955 You’re absolutely right! I love learning with and through him. Long may it continue! The explanation was obviously way too advanced for him but it was fun simplifying it to a point where he could accept the statement and premise.

  • @annblachly8068

    @annblachly8068

    2 жыл бұрын

    Show him DIRTH videos and let him decide.

  • @barndawg77
    @barndawg772 жыл бұрын

    This channel is just the chillest. I can just settle into the blankies, learn cool stuff and drift into slumber.

  • @ajm7375
    @ajm7375 Жыл бұрын

    I love you dude! You are my favorite channel to watch before I go to sleep, hoping my dreams have as much amazement

  • @odizzido
    @odizzido2 жыл бұрын

    17:18 I expected this video to be bad honestly, but I quite enjoyed it. Thanks for making it :)

  • @10000words1
    @10000words12 жыл бұрын

    Awesome video...one of the most thought provoking pieces I've seen on KZread in a long time. It seems they wouldn't even need to wrap the star entirely...if they had a list of candidate star systems, they could float filters in the line-of-site. These filters need not cover the entire star image. Just a small patch of green on an otherwise black body radiator would be a dramatic signal!

  • @crossfire1403
    @crossfire14032 жыл бұрын

    Great! I watched the video last night (Germany) an I had a really close look to the sunset a few hours ago: I really could see the green flash without any optics - with just my eyes! Just 2 seconds. First time in my life! Never thought about it. Never realized before. From now on I will always try to see the green flash. Thanks for this video!

  • @SayAhh

    @SayAhh

    2 жыл бұрын

    Lucky!

  • @fabrizionastri9484
    @fabrizionastri94842 жыл бұрын

    Thanks for this wonderful video, very informative as always on this channel. A small remark though: alien natural vision (if they have any) is probably not sensitive to the same spectrum of electromagnetic radiation frequencies as humans are, and if they are, they probably don't see colours in the same way that we do. “Green” is a purely human perception of a phenomenon whereby a light source (or lit surface) emits more electromagnetic radiation of ~550 nm (‘green’) wavelength that at 650 nm (‘blue’) or 450 nm (‘red) - irrespective of the amount of radiation emitted outside our visible spectrum (400-700nm). So, I doubt that alien would create a beacon by artificially filtering out 400~500nm and 600~700 nm radiation simply to make the 500~600 nm range relatively prominent. While they could indeed filter out some frequency range to make the start look unnatural, they could filter out any range, including outside our visible spectrum. So overall, the probability that (1) there are adanced aliens civilization in compatible space-time locations, (2) they want to make a beacon out a star and (3) they choose to do this by filtering out red & blue light, is in mho quite low... So, I won’t be expecting green stars anytime soon - unless it's humans from the future who used time travel to tinker with a star in our past.

  • @DrForester54
    @DrForester542 жыл бұрын

    I love this channel. Even after I've watched one of your videos multiple times, I will replay them for just the audio when I'm doing other things. They calm my mind. I am a Forestry professor at a university, and I think it says a lot when you can so capture the imagination and interest of someone from such a different scientific field. Keep up the amazing work.

  • @Drugsaddict16
    @Drugsaddict162 жыл бұрын

    Sir, the best thing about your videos, apart from the outstandingly researched and presented content, is the way you speak and present it in such an articulate language and exquisite vocabulary. Makes it a very present experience to listen

  • @almatt21

    @almatt21

    2 жыл бұрын

    Agreed, and visually pleasing. 😉

  • @nandekokoni3146
    @nandekokoni31462 жыл бұрын

    Just found a gold channel. Big Brain Quality

  • @josephrapp
    @josephrapp Жыл бұрын

    What a marvelous explanation! Thank you.

  • @billalumni7760
    @billalumni77602 жыл бұрын

    Very well explained. A great teacher is someone that can take complex subjects and explain them in a completely understandable way. Well done!

  • @AdeelDrew
    @AdeelDrew2 жыл бұрын

    Life was so boring before this video. Thank you, this made my day. 🧡

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    Life’s more fun when you think about the universe sometimes…

  • @trompie2161

    @trompie2161

    2 жыл бұрын

    Surely you have no life

  • @user-bt5zg7tf6o

    @user-bt5zg7tf6o

    2 жыл бұрын

    @@CoolWorldsLab YES, Ofcourse it is..!!

  • @annedrieck7316

    @annedrieck7316

    2 жыл бұрын

    @@CoolWorldsLab will there be purple stars?

  • @CartoonHero1986
    @CartoonHero19862 жыл бұрын

    Loved this! At the start of the video I was kind of like "but yellow dwarf stars like ours give off mostly blue and green light" then he started talking about combination light and how additive colour works to give us white light and I was like "f**king eh!" As a lighting technician trained in depth regarding how visible light and colour work this was amazing to watch.

  • @eddiec4536
    @eddiec45362 жыл бұрын

    Great video presentation. thank you for all your hard work in preparing all the works you do.

  • @picksalot1
    @picksalot12 жыл бұрын

    That was a particularly lucid presentation and I learned a lot from it. Perhaps creating a Green Beacon from the Sun doesn't require wrapping the entire sun. Just making a big enough device/filter/lens close enough to a Sun to transmit/produce a strong enough green light signal would be enough for an advanced civilization to detect it. I really enjoy this type of video - Learn some cool science, and conjecture about how what is known can be used. I hope you'll continue to make more videos like this. Thanks 😎

  • @SebastiansFacts
    @SebastiansFacts2 жыл бұрын

    I love this guy so much. This channel produces some of the best videos on KZread, no debate.

  • @Milennin
    @Milennin2 жыл бұрын

    I had already heard of this before, but not really with any kind of explanation that made it understandable why green stars aren't possible. This video was very informational.

  • @jonkallas7326
    @jonkallas7326 Жыл бұрын

    Are our dreams of green stars other universes? I've been watching your incredible videos for some time now and keep revisiting this one. In my opinion, this video may be one of the most important ones you've done to date. Thank you for these videos. They're very important to me and I'm sure many others. A beautiful escape from a stressful life. Peace.

  • @bengoodwin2141
    @bengoodwin21412 жыл бұрын

    This is without a doubt the best explanation of this that I've seen. That said... Could you have a star surrounded by a gas that absorbed most light except for green? maybe that gas formed from an unusual elemental makeup of the star or material in the surrounding nebula? Could something like that last a significant amount of time compared to the star itself? Edit: you covered this too, it would be very unlikely to be natural. Neat!

  • @thegzak

    @thegzak

    2 жыл бұрын

    @Peter from NZ interesting thought, but I’d guess that water is too heavy to support a planet large enough to make a vapor cloud that can blot out a star - the planet would probably just attract a big gas shroud of its own and end up as a gas giant. Generally speaking, this would be hydrogen, not oxygen.

  • @clewfirstcfer
    @clewfirstcfer2 жыл бұрын

    Always a joy to watch, you bring a poetry to astrophysics unlike anything I've heard since Carl Sagan. Thank you.

  • @cabbageroll7115
    @cabbageroll71152 жыл бұрын

    Don't stop this format!

  • @qcenaman
    @qcenaman2 жыл бұрын

    Thank you so much for your work and videos. Sometimes I just lay down, listen to your voice without even looking at the screen, and let my imagination fly. You have a great voice and pace, you should consider some sort of audio books! Thank you to you and your team for all the work you do.

  • @KingsMom831
    @KingsMom8312 жыл бұрын

    I LOVE this channel so much! I can’t help but feel a similar sense of familiarity to listening to/watching Carl Sagan. You can’t help but be mesmerized. You are both incredible educators, reaching lifetimes of individuals, spanning across our world & maybe, one day, the universe & beyond. 🌏🌎🌍

  • @stephenw5628
    @stephenw56282 жыл бұрын

    This is amazing. I'd never read a good explanation why the sunset doesn't go through a phase of green before

  • @ericjohnson1811
    @ericjohnson18112 жыл бұрын

    This is really cool! Thanks for posting all of these enlightening videos!

  • @IsadorCz
    @IsadorCz Жыл бұрын

    This video made me click subscribe button before i reached half of it. Its so well made. I am looking for more!

  • @gabrielecoco5588
    @gabrielecoco55882 жыл бұрын

    Beautiful narration, beautiful voice and amazing video!

  • @jb_
    @jb_2 жыл бұрын

    Fascinating stuff, thanks David. I’ve been trying to film a green flash for a few years whenever the opportunity pops up (not often enough when I’m home in England ;)

  • @agusrodriguez1
    @agusrodriguez12 жыл бұрын

    I never thought of blue stars, but it makes sense. There are blue flames, like from a gas furnace. Great video as usual.

  • @semicedevine6918
    @semicedevine6918 Жыл бұрын

    I'd like to argue that the green star technosignature would only work if alien civilizations had the same three cones, R, G, and B as us humans do. It's not guaranteed that they observe the same portion of the visible light spectrum as us.

  • @whyte2wolf

    @whyte2wolf

    Жыл бұрын

    I think the point is that regardless of how they perceive it (or if they perceive it--or indeed, what they call it) the electromagnetic wavelength of the light that we call Green (900 nm as stated in the video) cannot be a natural emission from a star, thus it's a techno signature if that wavelength is made overwhelmingly observable to distant observers. We can't perceive x-rays directly, but we can measure them and manipulate them, meaning an advanced civilization could do something similar even if they can't perceive the same visual space that our eyes can.

  • @swainscheps

    @swainscheps

    12 күн бұрын

    @@whyte2wolfI’m not following. I thought the video essentially said that stars with peak radiation at the green level exist (at 5500 degrees or whatever it was) but… due to the shape of the black body radiation curve, even though the peak is at green light, you get so much blue/ red light ALSO that our brains see it as white. In other words…there are green stars out there, humans just see them as white stars due to the way we process combinations of spectra of light. So imagine aliens w: brains that processed light differently - say they amplify the peak spectrum and de-amplify weaker spectra (so they’d have no concept of ‘white light’…wouldn’t they see plenty of ‘green’ stars?

  • @dankline9162
    @dankline91622 жыл бұрын

    I like the idea about making and looking for techosignatures, and artificially learning how to make a green star would be awesome, but it's simplistic to assume that an alien would make a green star for us to find. Their visible band of light may be different from ours. The laws of physics are the same anywhere in the universe, so it is plausible that a totally separate life form could evolve similar mechanisms to sense its environment, but even IF a powerful technological spacefaring species saw this phenomenon with starlight, they would then make a "green" star based on what THEY see, and so, we should just look for a star whose light signature is compressed towards a particular wavelength.

  • @FingerinUrDaughter

    @FingerinUrDaughter

    2 жыл бұрын

    "The laws of physics are the same anywhere in the universe" this is a statement that cannot be made. we have no experience outside of our own solar system, and virtually none outside of our own planet. without any way to actually test the "laws" of physics around even our own galaxy, much less between galaxies or in other galaxies, we have absolutely no idea if these are actually universal laws.

  • @KingOfAllJackals

    @KingOfAllJackals

    Жыл бұрын

    @@FingerinUrDaughter The video covers this starting at about 10:45. You could pick different values for the Planck and Boltzmann constants or speed of light and the shape of the BB emission spectrum stays the same. It’s unfair to say we don’t know what’s going on in the rest of the universe. One of the earliest confirmations of relativity came from the sun bending light from distant stars. We can detect all manner of weird objects/events from black holes and pulsars to gravitational waves precisely because we can apply universal laws and extrapolate what happened at mind boggling scales of mass, velocity, pressure, distance and time. There are limits (Dark energy? Dark matter?) but we’re not ignorant.

  • @Straatbrak
    @Straatbrak2 жыл бұрын

    Thank you for another video

  • @CoolWorldsLab

    @CoolWorldsLab

    2 жыл бұрын

    👍

  • @akk2766
    @akk27662 жыл бұрын

    I've been intrigued by the quality of research that goes into each video. Keep it up! Now, any chance you cool guys and gals at Cool Worlds Lab are investigating the Grand Solar Minimum that we are just now entering for the next 30+ years (2020 to 2053)?

  • @GhostAR-do1xc
    @GhostAR-do1xc2 жыл бұрын

    Your videos are amazing and so much informative . Please upload more videos about stars , dead stars, wormholes , voids , dark energy.

  • @RinoaL
    @RinoaL2 жыл бұрын

    Would be cool to make a fake star that emits green light

  • @jimfinan9132

    @jimfinan9132

    2 жыл бұрын

    Where’s the star?

  • @MuantanamoMobile

    @MuantanamoMobile

    2 жыл бұрын

    The star is real, the color isn't.

  • @johnalwaysforeverindeedjon8415

    @johnalwaysforeverindeedjon8415

    2 жыл бұрын

    I don't know if you notices changes in the sky,moon, day, and night.. I think it happended a few days again. it is a bit odd a bit odd indeed.

  • @sixthcairn

    @sixthcairn

    2 жыл бұрын

    As long as it doesn't involve Necrons.

  • @gnochhuos645

    @gnochhuos645

    2 жыл бұрын

    Aliens: We do a little trolling

  • @ForwardSynthesis
    @ForwardSynthesis2 жыл бұрын

    At the terminator region of a tidally locked planet, the star would hang permanently near the horizon. If you moved far enough around towards the darkside, shouldn't there be a zone where the last sliver of the star is visible and it appears permanently green?

  • @multiverse45
    @multiverse452 жыл бұрын

    Your voice and accent are very calming and relaxing 😎

  • @oleghofling8040
    @oleghofling80402 жыл бұрын

    This video literally blew my mind for some reason.

  • @erichv.300
    @erichv.3002 жыл бұрын

    Thank you so much for this informative video and all the others on your channel. Maybe i don't understand something correctly but i gotta ask one short question: why aren't we seeing green stars due to redshifting? Why isn't it possible for stars that emit blue light to appear green to the eye because of the doppler-effect? I am happy for an answer! Bye!

  • @MarkMichalowski

    @MarkMichalowski

    2 жыл бұрын

    Exactly what I was thinking :))

  • @mmdday
    @mmdday2 жыл бұрын

    Could humans have developed vision in the "visible spectrum" precisely because our sun's emissions are relatively flat (and peak) in that area? And relatedly, the green technosignature is only obvious and simple to us humans only because it's in the middle of our visible spectrum. For an alien civilization with a different star and vision system, they might focus on another part of the spectrum instead.

  • @piedpiper1172

    @piedpiper1172

    2 жыл бұрын

    Yes. That’s also why chlorophyll is green, because it’s the peak of our star’s emissions. An alien whose visual band began or ended at green would see many green stars, just as we see blue and red ones because they are the ends of ours.

  • @shrimpflea

    @shrimpflea

    2 жыл бұрын

    @@piedpiper1172 No, I think you are misunerstanding the actual physics at play here.

  • @piedpiper1172

    @piedpiper1172

    2 жыл бұрын

    @@shrimpflea Some Stars peak emissions are outside of our visual range. Either below (red stars) or above (blue stars). If you imagine a creature whose visual band ends at the wavelength we call green, rather than having it basically in the middle of their visual range, that is the wavelength they would see for a star at that end of their vision. For example, imagine their visual range began lower in red than ours does, but ended at its highest in green. So they seem from infrared to green. A star that is blue to us would be producing light mostly in their “ultra green” (beyond green) band.

  • @mikelanzano3806
    @mikelanzano38062 жыл бұрын

    Another excellent video- I personally consider stars to be the"radiators" of the Universe.

  • @Zanderof
    @Zanderof2 жыл бұрын

    My mind has had another layer added. Thank you. Odd couple concepts. What were to happen to a red shifted-blue star? Or if we just happen so be in a galacto synchronizate orbit of a star at the opposing side a black hole light curve. It could be any color of star with a reaction band of green to us only. What a sight to see. And such the bewildering idea of now surmised blackhole size based on gravitational strength effecting the light bend degree on such a scale.

  • @Kindrick
    @Kindrick2 жыл бұрын

    In a science fiction and high fantasy setting I've been writing about, there's 1 known green star in the galaxy, thus making its system the obvious choice for us to explore. Upon arriving, a planet is found with carefully constructed environments, and already inhabited with different species of humans, made to resemble fictional creatures from Terran mythology. Clearly a case of aliens playing God.

  • @slevinchannel7589

    @slevinchannel7589

    2 жыл бұрын

    Call me silly/random, but i just want to do my fellow Science-Lovers a Favor, so excuse the Randomness but here you go, have some warm Recommendations, cause the Learning never Ends! -Veritasium. -Oversimplified! -It’s ok to be smart. -Professor Dave Explains. -Krimson Rogue. -Practical Engineering -Michio Kaku. -Kosmo. -Legal Eagle.

  • @kalakritistudios

    @kalakritistudios

    Жыл бұрын

    Imagine, if all the aliens went there to explore.😂 It's a whole market. Like, "lmao, which one of you did this? Jeremy, was it you?" Or it could turn out hostile. Or just market. Business. A place to look for for aliens and thus all the civilizations looking for alien find aliens (each other). Nice UN place.

  • @Mahlak_Mriuani_Anatman

    @Mahlak_Mriuani_Anatman

    Жыл бұрын

    you cant play something that dosent exist

  • @bfgoodrich8564

    @bfgoodrich8564

    9 ай бұрын

    But our sun is a green star. We evolved in its light, so it looks white to us.

  • @Kindrick

    @Kindrick

    9 ай бұрын

    @@bfgoodrich8564, it peaks in the green, but it doesn't look green. Even if we didn't evolve under it and were suddenly exposed to it instead of a purely white star, it still wouldn't look green to us, because 1) its light isn't exclusively green, it branches out into the entire light spectrum and 2) it's too bright for us to ever make out just the green without filters or refractions. All this is why stars with our sun's frequency range are called white stars, rather than green stars. This all contrasts with the green star in my setting in that it doesn't give off any light in the visible spectrum except for the green frequency, making it visibly green to any casual observation of it.

  • @duality4y
    @duality4y2 жыл бұрын

    Well yea at the start I thought it was just a curiosity you know why no green stars but the further in the video the more it dawned on me that it could be used a as sign of something like a techno signature. after explaining that 900nm Really loved this video

  • @Dr.Reason
    @Dr.Reason2 жыл бұрын

    Finally a scientist that recognizes there are limits to the options in reality. Very well explained.

  • @havensule1644
    @havensule16442 жыл бұрын

    That was amazing! thank you for that insight. :)

Келесі