Hearing a scientist say things like "the known warp field solutions" is the best.

@DrDeuteron

Жыл бұрын

it's like the old beer commercial: if you got the stress energy, we got the curvature.

@jeremyonfire1

Жыл бұрын

Not to mention "yeeting themselves through the cosmos"

@kosmicamun

Жыл бұрын

@@jeremyonfire1 that was hilarious

@melaniecampbell7055

Жыл бұрын

How's it any different if it comes from a character out of DC comics?

@kosmicamun

Жыл бұрын

@@melaniecampbell7055 it isn't and i love both DC characters and Real Scientists

What Imperium Galactica 2 has taught me is that we need to divert 80% of resources to science for a couple of generations.

@anonymous-zg7wh

Жыл бұрын

YES YES YESSS

@PoorMansChemist

Жыл бұрын

Same for Master of Orion.

@brothermine2292

Жыл бұрын

In other words, the cost of the Extra-Large Hadron Collider.

@jcheck1107

Жыл бұрын

@@PoorMansChemist man I miss that game.

@wearethefruitoftheuniverse

Жыл бұрын

That means 80% of time towards studying

Alien: "Oh please. We use worm holes now. Sub-speed-of-light travel is soooo last universe."

The last thing I want to hear from a LIGO person: "That's no moon."

What a team. Thanks for making the world better.

@osmosisjones4912

Жыл бұрын

Travel as fare back in time as time is moving forward

@pierfrancescopeperoni

Жыл бұрын

​@@osmosisjones4912 Time does not move

@NPCSpotter

Жыл бұрын

So cringe. How are they making the world better lol

@Archgeek0

Жыл бұрын

@@NPCSpotter Wide-flung cosmic elucidation, duh. A candle in the dark of our demon-haunted world.

@willmercury

Жыл бұрын

​@@NPCSpotter They're clearly making his experience of the world better, and they clearly appreciate the compliment. Meanwhile, your horse is so high it shits mountains.

The simulated visuals of black hole mergers always make me do a double take, because the resulting black hole seems so much bigger than it should be. I know why it is: the equation for the Schwarzschild radius of a black hole has the counterintuitive feature of radius scaling *linearly* with mass, in contrast with our everyday experience of fluids with near-constant density and thus *volume* that scales linearly with mass. But seeing that play out in simulated mergers still gives the impression of the sum being much bigger than its parts, rather than the reality that a lot of mass has been lost to gravitational waves.

@lyrimetacurl0

Жыл бұрын

Because it seems to violate dimensional conservation, as if black holes are 1D. I could understand if black holes scaled like the mass was concentrated in an outer sphere, but instead they act like from the viewer's perspective the mass is concentrated in a circle (edge) instead. Also seems amazing that gravitational waves dissipate as if space is 2D (1-sphere) rather than going out in a 2-sphere, yet normal gravitation itself goes out in a 2-sphere (3 dimensions). 🤔

@tonywells6990

Жыл бұрын

@@lyrimetacurl0 Gravitational wave energy still dissipates as 1/distance^2.

@DrDeuteron

Жыл бұрын

entropy goes as the area, so I guess it goes up.

@moocowpong1

Жыл бұрын

@@tonywells6990 yeah, that threw me for a loop for a while, but I figured out that EM waves are the same way-amplitude goes as 1/r, energy goes as 1/r^2. It’s just a quirk of the fact that we’re almost entirely transparent to gravitational waves, so we can’t build detectors that work like EM wave detectors. And in terms of energy, black hole mergers are unbelievably “bright”; it’s just that we can only interact with that energy in limited ways.

@KarlLaczko

Жыл бұрын

​@@moocowpong1 thank you! That was exactly the question I came to the comments looking for an answer to!

As is sometimes the case, some of these concepts have been used in Science Fiction. Joe Haldeman’s “Mindbridge” used such a gravity wave generating space drive for his aliens. Larry Niven’s “Shipstar” was a small planet sized spacecraft that harnessed some of its sun’s output for it’s propulsion. The chuckle inducing bit though, is the term “Rama-craft”. Someone was inspired by Arthur C Clarke’s “Rendezvous With Rama”

@DevonKlosterman

Жыл бұрын

It's a really good book, would recommend.

@cha0sniper

Жыл бұрын

Lol, as soon as I heard the acronym, I came down to find comments about it xD I was like, hey, I remember that book!

@artem65535

Жыл бұрын

And Larry Niven's "The Hole Man" describes an alien communication device that uses small black hole to generate gravitational waves.

@idontwantahandlethough

Жыл бұрын

_small planet sized spacecraft_ lol i know you meant that it's the size of a small planet, but at first I read that as you saying that a planet-sized spaceship is small 😂 (and who knows, maybe that *is* small somewhere in the universe!)

@jozseffabri

Жыл бұрын

Also I remember reading a novel from the 60s where the final twist was that quasars have their huge redshift because they are actually stars turned into propulsion devices for their entire solar systems, and advanced alien civilisations leaving the Milky Way galaxy with them, fleeing from some cosmic fate.

i like how Dr O'Dowd always brings it altogether with the words Space Time at the end of each vid

@andywhelan8608

Жыл бұрын

Always wondered if it was inspired by yes minister/yes prime minister

@oisyn-

Жыл бұрын

I like how his elbows always seem to be attached to his torso. He's basically a T-Rex.

I was more than 10 minutes in before I realized that RAMAcraft is almost certainly a reference to Rendezvous With Rama.

Never thought I'd hear about aliens yeeting themselves across the universe at a fraction of the speed of light, hooning about causing wibble wobbling in space time. Great video, seriously an awesome explanation of LIGO and what it's used for.

Ah, yes. Installing gravitational subspace sensors in Stellaris always feels good! Not as good as the tachyon sensors though...

I would really like to rendezvous with such a RAMA

How fast would I need to flap my arms for LIGO to detect the gravitational waves? If I went from stillness to flapping them at 99% the speed of light, would LIGO detect it?

@RHCole

Жыл бұрын

👍🏻

@AdrianBoyko

Жыл бұрын

If you’re flapping, then your arms are still at the top and bottom of every cycle. How many flaps per second can you manage? Hummingbird speed?

@valentyn.kostiuk

Жыл бұрын

I would assume that seismic detectors would be able to do this. Maybe on the other side of planet. Just by friction with air there could be enough energy produced for it to be like dropping a bomb.

@philiphunt-bull5817

Жыл бұрын

XKCD should cover this.

@zutaca2825

Жыл бұрын

You would need the same acceleration as any other RAMA, so 300 million meters per second squared, or about 30 million times the acceleration of Earth’s gravity at sea level

Perhaps some Aliens use gravitational waves for communication, their ability to pass through basically anything can be very useful provided you have technology to detect tiny waves.

@frun

Жыл бұрын

Aliens 👾👽 are using subquantum waves 🌊 for nearly instant communication. But these are astonishingly advanced 👽.

@beaupullens7782

Жыл бұрын

@@frun That is completely unproven and it would probably be better not to present it like a proven fact

@brianawilk285

Жыл бұрын

It would be like playing a massively long guitar string and you can play an endless amount of notes on just one string. So I could definitely see it being used for communication.

@Person-ef4xj

Жыл бұрын

Maybe they use a combination of gravitational and electromagnetic waves. For instance I could imagine electromagnetic waves getting used for short distance communication and gravitational waves getting used for long distance communication.

@ORBITALAURORA

Жыл бұрын

You just need to have a way for gravitational waves to express theirselves within a closed system. I use magnetic nano particles in a meta material configuration to time develop my MRI like images realigning the each pixelated domain into holographic images of Dark Information Energy reaching forth beyond our spacetime. Sounds fantastic but fear not 🖖 I have made contact and I don’t know how to tell you this 🤷🏻‍♂️ They are on their way 🫡 kzread.infoubmkTQ6EyU4?feature=share

I always loved physics, and finding Space Time is one of the best things that happened to me. I look forward to every new episode, I usually watch it first thing in the morning (living in Europe it's often to late for me to catch it in the evening), and I literally have an episode playing every time I go to sleep. It's not only interesting, it calms me down, even on the most stressful of days, and there are a lot of those. So I just wanted to say thank you, from the bottom of my heart, for putting so much effort and love into the series. You guys are simply awesome and you enrich my life ❤

@AlbertaGeek

Жыл бұрын

That was wholesome AF. Cheers from Canada!

Love how matt is wearing the “it’s never aliens” shirt lol

I love these videos! The part about gravitational waves propagating at the inverse of distance as to distance squared I found especially intriguing.

What's crazy is if we detect such a craft in another galaxy,that species may very well be extinct

@killman369547

Жыл бұрын

That could be. If we do find one it's going to be positively ancient, untold millions of years old. The civilization that built them would've probably collapsed to dust long ago. But that would mean a free planetcraft or attack moon for us if we could somehow get to it.

@MrMsedek

Жыл бұрын

What makes you think that a civilization that has the abilty to build such tech would be extinct? Lol

@punishanpika

Жыл бұрын

Maybe due to speciation or genetic drift. 😮

@limesta

Жыл бұрын

@@MrMsedek anything lasting for millions of years is unlikely, but at the very least what we see is garaunteed to no longer exist, like early humans, we've evolved to a point where our past selves are not recognizable

Amazing content as always. Not sure if it's just me, but I feel like I actually understood close to 100% of the presentation here, so bravo Dr. Matt!

@JLchevz

Жыл бұрын

Yeah this one wasn't too difficult to understand like others lol

@jackbedient

Жыл бұрын

Likewise! Great stuff…

@chromegames839

Жыл бұрын

True ...im guessing this topic isnt as hatd to grasp as the others...but also well put by Dr. Matt.. Love the 9:08!!!

@bubblebobble9654

Жыл бұрын

His specialty is presenting only the information a general audience can understand. If you're really interested, check out the Susskind theoretical minimum series for the next level. And if you're still interested, check out a textbook or an actual class on QM or GR from your local university!

@Aurinkohirvi

Жыл бұрын

I'm amazed I understood the whole video! Doesn't happen often. But they are still very cool to watch.

Arthur C Clarke still having influence from beyond the grave. A true visionary.

@DrWhom

Жыл бұрын

Hate to burst your bubble, but he really was not the first in many of his famous visions and bon-mots. Nor do I think he really pretended to be (although for my money I do think he was a stuck-up self-promoter, but that's just one man's opinion); those of us who knew 50s and 60s sci fi and popular mechanics type publications knew well enough that the stuff predated his, but then in the 90s this odd Arthur C. Clarke myth just slowly too over.

@yp77738yp77739

Жыл бұрын

@@DrWhom I’d agree that Asimov was a better science writer and most of Clarkes ideas weren’t novel. But 2001 had a huge influence on me as a child and the philosophical and evolutionary ideas introduced to me still form me today, even directing career paths. I only have to hear also sprach Zarathustra still today and I perceive it is akin to a spiritual experience for a believer in a deity.

@martijn8554

Жыл бұрын

​@@DrWhom i suspect they are referring to the fact that Arthur C Clarke wrote a series of books about a craft called Rama that was large and could achieve large acceleration (not the scales mentioned in this episode, but still).

Tremendous how vast the universe is 😳

i feel my heart skip a beat everytime pbs space time uploads

16:18 planet sized spacecraft “hooning” around out there… a great Aussie way to put it

Damn, the first second of of the spiriling black hole sound triggered me as I though my cockapoo was barking. Do I need help? 🤣🤣

Three Body Problem series readers: _flashbacks_

First, props to whoever came up with RAMAcraft. That's a good acronym/reference. Second, I'm really surprised that gravitational waves drop with an inverse law rather than an inverse square. How does that work? I thought that inverse square laws were a natural consequence of the way things expand into 3-dimensional space as 2-d surface.

@tonywells6990

Жыл бұрын

The energy of gravitational waves do drop with the inverse squared law (like electromagnetism) but it is the 'strain' or amplitude or intensity of the waves that drops as inverse law, same as the amplitude of any wave. The difference is that we detect electromagnetic waves by absorbing their energy in discrete frequencies which are proportional to their energy, via photons. Fortunately for us the way that we detect gravitational waves is based on their amplitude (which is what stretches and compresses spacetime) and not on absorbing their energy.

I asked this exact question to Joseph Giaime at LIGO back in 2019. Here is his response: "It is not thought possible for a civilization with our current or near- to mid-future technical abilities to generate gravitational waves strong enough for us to detect. This is because spacetime is quite stiff, and difficult to significantly excite waves in, by moving things lighter than stars. In fact, it is a standard exercise for Ph.D. students in our field to attempt to design such a presently-impossible 'transmitter.' For similar reasons, I've never seen a plausible design to use GWs for propulsion. "

@kadegreen5356

Жыл бұрын

Here was my question: " There has been a lot of attention on the "Advanced Aerospace Propulsion" topic of recent, and I'd like to approach some experts in the field of Gravitational Waves via email. Two silly questions to sip coffee over on a Monday morning: - Suppose there was a vehicle that operated via producing "Gravitational Waves". Would such a craft be detectable via the Ligo Detectors? - What is the feasibility of smaller "Hobbyist Grade" detectors? '

@DrWhom

Жыл бұрын

"quite stiff" is the studied understatement of a physics educator - stirring basalt with a paper coffee stirrer is a walk in the park by comparison

Rendezvous with Rama - a classic story :)

If they're anything like us, at least some of their young adults with too much free time have fitted Mega-Grav spoilers on their sportsters to do donuts at 3 AM in a quiet solar system where people need to get up and go to work in the morning!

@pigbenis8366

Жыл бұрын

😂

I just want to see a real Alien before i die, come on universe, make it happen 🙏🙏🙏

@jan.kowalski

Жыл бұрын

You are an alien, just for somebody else.

@nullbeyondo

Жыл бұрын

Would it disappoint you it if was just bacteria of some sort?

@gamingcreatesworlddd2425

Жыл бұрын

​@@nullbeyondo no it will confirm that life outside earth exists

5:07 it's funny how he gets a lisp for 1 moment and never has is before or after

Neat. Maybe we can find the Puppeteer Fleet of Worlds.

@AlbertaGeek

Жыл бұрын

Sick reference, bro.

One of the most understandable episodes. Thanks.

If a RAMACraft was accelerating with that much energy inside our galaxy, wouldn't we see it with more traditional methods?

@matrixmodexp

Жыл бұрын

Well I guess it would depend on how far it was away. Like he said the main thing about other signals is that they fall off with a lot greater strength compared to gravity

@killman369547

Жыл бұрын

That depends if it's accelerating through a nebula or through empty space. If it's accelerating inside a nebula it will compress the stellar gas in front of it immensely causing it to glow and maybe even forming a new star or two.

@Crushnaut

Жыл бұрын

@@killman369547 you assume it is coming straight at us, if not, the engine exhaust should easily be visible

Yay, unique "no questions" messages are back!

The AMPLITUDE of electromagnetic and gravitational waves decrease with 1/(distance). The power density decreases with 1/(distance^2) for both. The power of an electromagnetic wave or gravitational wave is proportional to the amplitude squared.

Alderaan: You can detect moon sized objects accelerating towards us? Tell me more. Matt: You need a Jupiter sized ship accelerating at 30% speed of light in a second. Buster Machine 3: Hold on my beer!

Considering all the reports of our neighbors crafts not producing any sound and that they don't seem to affect more than their immediate surroundings, - it is also quite likely that the craft wouldn't create gravitational wakes at all, or at least not to the extent their mass and acceleration would imply.

@dammitdan106

Жыл бұрын

This right here.

@filonin2

Жыл бұрын

Reports? There are no reports. Just nutters and liars.

@808bigisland

Жыл бұрын

Seen them. They don’t use gravitics.

@jan.kowalski

Жыл бұрын

Yes, they use time. Crafts move relatively slow in space, but they just throw themselves into future/past as needed. From our perspective they move with absurd acceleration.

4:34 WOAH! Mindblown! The gravity waves caused by merging black holes - only mass of our Sun - could be greater than energy of all the light emitted by the stars in the observable universe! That is SERIOUS stuff! Then supermassive black holes merging....

I've learned a lot from this video. Lots of facts but the one that stood out to me was that Ligo can triangulate the location of multiple dancing chickens at any given time.

Could we detect Deceleration as well? also, how large would a craft have to be within our own star system?

@emm6064

Жыл бұрын

I'm fairly certain anyone accelerating like that _within_ the solar system would be waaaaay more easily detectable with the EM spectrum.

@therealquade

Жыл бұрын

@@emm6064 I mean, yes, but no. What if they're using something other than electricity for their propulsion? some sort of high energy propellent that we have yet to understand, or some bit of physics that we haven't discovered. This *is* a thought experiment after all.

@MarsStarcruiser

11 ай бұрын

Yes, if conventional then large amounts of energy will have to be ejected in our general direction to counter the existing momentum . But even if hypothetically FTL, I’d speculate we’d see rather bright streak of Cherenkov Radiation. In all cases where particles can temporarily move at speeds faster than the allowable relative lightspeed of the nearby medium, this emission has occurred. We observe this in isotopic interactions and from neutron stars, where light speed in the areas has been slowed down but the same rules should still apply for something transition from FTL to normal space too.

Matt is here to tell us to expect the aliens to come in from a direction we're not currently watching in

13:28 It's an apples to oranges comparison -- intensity is amplitude squared. Strain is the gravitational wave amplitude. So you're talking about the 1/r^2 *intensity* decay law for EM waves and comparing it to the 1/r *amplitude* decay law for gravity waves, and then concluding that gravitational waves decay slower. Good one

Rendezvous with Rama is unironically a fantastic science fiction book about a huge mysterious object entering the solar system.

RAMA spaceships aren't the only linear accelerators that would emit detectable gravitational waves. In a (very rare) head-on collision between two black holes the acceleration of each black hole would be linear. So when LIGO detects this signal, remember "it's never aliens."

@notheisenbear5686

Жыл бұрын

I'm guessing aliens would be more likely. An aligned, head-on collision, of tiny radius singularities seems nearly impossible.

@brothermine2292

Жыл бұрын

@@notheisenbear5686 : I partially agree with you: head-on collisions ought to be very rare. But that doesn't mean RAMA-capable aliens are more likely than head-on collisions... perhaps RAMA technology is impossible. (It's never aliens.)

@monochr0m

Жыл бұрын

That is essentially the conclusion to the video...

@filonin2

Жыл бұрын

@@brothermine2292 Aliens seem more likely than two arbitrarily small points hitting each other head-on in space. They would need to have literally zero lateral momentum.

@brothermine2292

Жыл бұрын

@NotHeisenBear : The event horizons are much larger than points, so head-on black hole collisions don't require a collision of two point-like objects. Also, black holes spin, and Penrose calculated the singularity of a spinning black hole is ring-shaped, not a point.

The interesting thing is that such a thing would be trackable, at least to a degree. I mean, depending on how long they are actually accelerating, of course. Even a long shot is worth keeping in our minds.

@UniDocs_Mahapushpa_Cyavana

Жыл бұрын

It would be scary if it was on Earth 🌍. 😱😱😱

@silversonic1

Жыл бұрын

@@UniDocs_Mahapushpa_Cyavana Well, I'm only talking about detecting. It's clearly not an effective means of travel.

@UniDocs_Mahapushpa_Cyavana

Жыл бұрын

@@silversonic1 Detecting such a thing on Earth 🌍 *is* the scary 😱 part.

thanks Matt, your show de-stresses my day.

On behalf of the LISA Social Media team ... thanks for remembering us.

Salutations from Brazil! There are just some months since I found this channel in KZread, and it is already my favorite science channel alongside 3B1b, with the advantage of updating more or less regularly. The videos are probably the most precise in KZread on advanced physics, and watching them is the nearest experience to reading Feynman’s lectures that anyone may find here.

@_John_P

Жыл бұрын

Fan fact, 3 people in the production of PBS Space Time are from Brazil and 2 from Portugal.

@pacotaco1246

Жыл бұрын

Ooh you would probably like the channel ScienceClicEnglish! They have their videos in other languages too! Such as french and Spanish!

The idea of a super advanced aliens getting together with their friends doing burnouts was a wonderful image to end on :)

@billboyd4051

Жыл бұрын

They do put on a great show at times, but their burnouts are silent.

@swannie1503

Жыл бұрын

@@billboyd4051 In space, no one can hear you hoon

@billboyd4051

Жыл бұрын

@@swannie1503 OOOOOOmmmmmmmmmmmm

Of course, begs the question: What would it take to upgrade the current LIGO system so it *could* detect a large ship at a reasonable distance? Assuming we're currently technologically able to do it at all.

The video that might very well force a dual purpose for NASA (or similar). Not just signs of life such as microbiology, but a way to implement signs of advanced life. Awesome video!

“Gravity is the weakest force” “One pair of merging black holes radiate more power than all the visible light radiated by all the stars in the visible universe”

@bernardsegonnes1335

Жыл бұрын

Has gravity is the weakest force, and for instance magnetic force is a lot stronger. In theory, a huge magnetic field may be able to 'extract' mater from a back hole ? Or closer to us : using magnetic field, we could extract mater/gaz from Venus or Jupiter atmosphere from far enough away (for any purpose such as fulling ship tank for instance). Gaz that could be later used in a ion like engine

@dlevi67

Жыл бұрын

@@bernardsegonnes1335 Gravity is the weakest force (smallest coupling constant), but the masses involved are very large... What is holding matter (or whatever is left) inside an event horizon is not a 'force'; it's the fact that spacetime is moving 'inwards' faster than the speed of light.

@CarFreeSegnitz

Жыл бұрын

Yes, gravity is the weakest force. Bugs barely notice it. We routinely win against it by lifting anything or ourselves with our seemingly puny muscles. Gravity is so weak because the medium on which it acts, spacetime, is so stiff. And why it acts at arbitrary distance. So stiff that it takes the most extreme event, the collision of black holes, to create barely detectable ripples.

@infinitemonkey917

Жыл бұрын

@@bernardsegonnes1335 How do you plan to extract something from beyond the event horizon where nothing can escape ? Invent new physics I suppose.

@bernardsegonnes1335

Жыл бұрын

@@infinitemonkey917 I said in theory... Anyway a more useful stuff would be to get gas from planet atmosphere using magnetic fields (Venus titan) to refill spaceship or probe tanks. It seems to me a lot easier than landing, mining, vaporize, and lift off to bring to orbit Of course we would need power... Nuclear reactor. But it is not the video topic. So about any force stronger thant gravity... What can we expect from that in 1000 years from now ?

Seems like extremely advanced aliens might create a gravitational wave beacon. Developing civilizations could then turn their radio telescopes to the beacon and tune in. It would be their way of getting subscribers.😂

@billboyd4051

Жыл бұрын

For a civilization to develop, it must first stop shooting each other, out of fear, greed, racism, hatred and religious beliefs.

@Deipnosophist_the_Gastronomer

Жыл бұрын

clickbait 😁

@punishanpika

Жыл бұрын

Actually true though

@billboyd4051

Жыл бұрын

The time delay still exists, a very long delay.

@markstipulkoski1389

Жыл бұрын

@@billboyd4051 Maybe the situation would be similar to the book/movie Contact. They create the beacon to announce their presence in all directions, and we, a civilizations advanced enough to detect the beacon would figure they want to talk and we send a focused high energy radio communications back saying we are interested in talking. After a few thousand years, we get back a radio message that instructs us on how to link up with their network of wormholes or create a hyperspace radio, if such things are really possible. Hopefully they don't call themselves "The Borg".

Great episode

Another Great Video, thank you so much for the awesome videos!!!

Why do we always assume aliens will think like we do? Much less build things like we do, or even know our form of math. perhaps they know completely different ways of thinking that would be mind boggling to us.

@BlueFrenzy

Жыл бұрын

It's not like we always assume that. We do. But you cannot design an experiment to detect something that we have never thought of. So we are limited to try ideas we humans can think of.

@DrWhom

Жыл бұрын

You are quite right, except about maths. (It is maths with an S, you silly American!) The maths is the one thing I know we will have in common with the aliens, as far as the one with the weaker maths goes, barring differences in notation (which can make a big difference).

Gravitational waves 🌌🌊 could be used for a bunch of things like fast travel, a sensory apparatus, weapons, a by-product of doing something else fancy, etc.

@filonin2

Жыл бұрын

Not by any means we can conceive of.

I do look forward to when spaceX reveals their interplanetary "yeet" drive.

I can't help but smile when the highly speculative nature of this topic is emphasized. I suspect people get the speculative nature when you are talking about aliens right off the get-go, my friend.

@michaelmicek

Жыл бұрын

I dunno.

imagine a big space wave pool, maybe they use them for leisure. like instead of water they all hop in their ships and ride generated gravity waves for fun? that'd be cool

@billboyd4051

Жыл бұрын

An ultralight spaceship, batteries not included.

There is of course the chance that the aliens design some kind of 'gravitational wave suppressor' in order to make their ships undetectable.

@laurenpinschannels

Жыл бұрын

do we have any hint of an inkling of physics that would permit this?

@UniDocs_Mahapushpa_Cyavana

Жыл бұрын

That requires them wanting to hide from other aliens 👽.

@CarFreeSegnitz

Жыл бұрын

Yeah, a warp bubble. Even mentioned in the video. But they’d still need negative mass and an ungodly amount of energy.

@markrockliff2742

Жыл бұрын

maybe they use two faze gravity anti gravity and gravity to pinball there way around the galaxy. They are pretty smart critters.

@brianawilk285

Жыл бұрын

@@laurenpinschannels alcubierre drive types of theories. Thats why he says gravitational waves bcuz your not going faster than the speed of light you're stretching on contracting space itself kinda like making a continuous wormhole. In this case it doesn't violate laws of physics. Yeah you need enormous amounts of energy but were talking about beings that possibly been around much longer than humanity.

Love your shirt, Matt and obviously your knowledge and this channel in general 😄

12:34 It's actually really interesting that the sensitivity to detect gravitational waves decreases linearly with distance instead of with the square of the distance like detecting light. Just on the face of it you would think that gravitational wave detectors would be subject to the same inverse square law, but as touched on briefly in the video telescopes measure the "intensity" of light while gravitational wave detectors are measuring the "amplitude" of the waves, not the intensity. And while intensity dissipates according to the inverse square law, the amplitude of waves does not. Or to put it another way, intensity of these waves is a function of the square of the amplitude, so since intensity dissipates using an inverse square law it follows that amplitude dissipates as a linear function of distance instead. (As an aside this is also, from what I can tell, true for sound waves, for instance. Our eardrums detect the intensity of sound waves, which disperse using an inverse square law. But if you want to emulate a similar effect in digital audio you need to adjust the amplitude of the wave linearly to make it "sound" like it's that same distance away to your ear.) Honestly the relationship between intensity and amplitude and the inverse square law could be an interesting topic for a future video maybe, just a thought.🙂

@jan.kowalski

Жыл бұрын

That's because we are probably living in a simulation. Hello fellow NPC!

@michaelmicek

Жыл бұрын

Are you accounting for the logarithmic nature of sound perception?

@Bodyknock

Жыл бұрын

@@michaelmicek Not specifically no. I'm simply talking about how the energy of a wave is proportional to the square of its amplitude. Since energy dissipates with the square of the distance that means the amplitude dissipates linearly with the distance.

Astronomers: "No UFO/UAP's are legit, aliens cant get to Earth, dont be preposterous, i wont look at this nonsense." Also Astronomers: "Could we use gravity waves to detect ET spaceships? How do we detect dyson spheres?" The public: "Ok dude."

@cykkm

Жыл бұрын

“Astronomers: ‘No UFO/UAP's are legit, aliens cant get to Earth…’” - This is changing, fortunately. Many people would call it nonsense, but at the very least not _all._

@CarFreeSegnitz

Жыл бұрын

The odds of ET coming HERE, to Earth, to roam our skies and show us how to pile rocks on top of each other is very low. The odds of ET going from anywhere to anywhere else in a fashion that we might detect is higher. Dyson spheres are much more likely than ET getting around in Jupiter-sized relativistic spaceships.

@cykkm

Жыл бұрын

@@CarFreeSegnitz Don't spill the beans!!!

@billboyd4051

Жыл бұрын

@@CarFreeSegnitz They are here already, and if you take the time to watch the skies you can see them.

@tonywells6990

Жыл бұрын

@@billboyd4051 Don't you need to snort a copious amount of drugs to see them though?

If we find aliens, it will probably be a repeat of Avatar where a human betrays mankind to clap an alien

@uninterestedcat8429

Жыл бұрын

I volunteer myself as tribute

@imeprezime4764

Жыл бұрын

I would for sure be that guy

@RocketPropelledMexican

Жыл бұрын

Or worse, the ETO from Three Body Problem/Dark Forest

@AlbertaGeek

Жыл бұрын

If we find aliens, they sure AF won't look anything like us.

At 15:29 the proper expression (especially in this context) is "on the gripping hand".

if we had multiple interferometer observatories, with enough distance between them to determine the shape of the wave, as well as the difference in amplitude across the wave, we would be able to determine the source of the wave, cause each of the interactions described will create a wave with a slightly different profile, and with enough sensitivity, it would be possible to determine whether we were seeing a linearly oriented gravitational interaction, or the gravitational equivalent to a sonic boom.

You got right to the precipice of the point I've been interested in for years. Namely,if a highly advanced civilization wants to communicate they aren't going to opt for electromagnetic waves, but more likely some form of gravitational wave antenna or quantum communications system.. if we're ever going to intercept that communication, we need to assume that they have some clever way of leveraging quantum entanglement or gravitational radiation or some peculiar combination therein. Either way, great episode!!

Thank you

1:44 LOL. Gotta love the full frontal nerdity on display with the name here. Personally I'd have gone with a Heart of Gold reference, except that the full name's too long, the abbreviation is awkward, and that particular ship works by hacking QM, not GR.

I love the Rendezvous with Rama reference.

There is way to produce gravitation wave with accelerating/decelerating rings. As gravitational wave is basically the oscillation "speed" of time (hard to explain). By creating high speed massive particles within short time creates a fluctuation in space time. Using many such a ring placed next to each other and accelerating particle in the right moments will increase the amplitude of the wave. As the time "speed" is oscillating it could have interesting effects. The major technology challenge is how you transfer the enormous amount of energy required from one ring to the other.

Videos about aliens are my favorite.

Literally the smartest explainer I’ve seen

Listening to this in the background at work, and that blackhole noise scared the heck out of me lol

Rama craft? Love it. Arthur c Clark still working from beyond the grave, lol.

Ripples in space time, what a concept : )

LISA coming online and us discovering that there's not just signs of Ramacraft out there but lots of them implying a whole galactic civilization and what do we do then is a neat idea for a sci-fi series. :)

@user-wo5dm8ci1g

Жыл бұрын

Or we turn it on and see nothing but breaking waves approaching the Sol system >_>

Very very interesting video. Keep the hard work.

Replace LIGO with Legos, and this video gets even more interesting. The Americans, Europeans and Japanese made huge Lego science projects, able to detect the gravitational waves from black holes by stretching 6 by 2 Lego blocks.

5:45 aliens yeeting themselves got me cracking up 🤣🤣

@PhilippBrandAkatosh

Жыл бұрын

me too, this came to my mind while i was thinking about the sentence :) : kzread.info/dash/bejne/oIKIuNywmqjfkpc.html

Lisa & Ligo song - to tune of A Few of my Favourite things. LIGO did land based, and LISA is in space. Little gold cubes, floating free in a space ship. One day we'll find out if gravitational waves, can be low frequency and also high! LIGO land bound, LISA space bound cubes floating free. Science is great, and science is good Knowledge for you; and me. :)

As you mentioned, accelerating in such a way so that we produce gravitational waves just like normal accelerating mass will result in a huuuge loss of energy in these waves. So we can expect a civilization advanced enough to make a spacecraft with mass of Jupiter or a star, able to accelerate to good fraction of speed of sound, is quite likely to find a way to do this without emitting a gravitational wave, like the warp drive you mentioned

This reminds me of the three body problem series

@Snowsnaype

Жыл бұрын

Hide well, cleanse well.

4:13 Perfect opportunity for a “yo mama” joke

What an amazing and interesting video. Thank you !

Nice work on the video!

Now we just need to start planning for a rendevous with RAMA - craft.

Thanks for all the great informative shows on this site by the way, learn a lot. Way over my education-grade :)

Observing gravitational waves for a... Rendezvous with Rama

Negatively accelerating bodies would also indicate some alien life that had arrived somewhere that they wanted to go.....which hopefully LIGO would detect before they demolished us at Minecraft

I'm glad that this is a topic that science is capable of taking reasonably seriously. Regardless of whatever alien life may or may not be out there for us to find, thought experiments like this are valuable and useful because they encourage us to constantly seek out new ideas of things to look for and how to see them. It's like militaries and disaster response agencies considering how they would respond to scenarios like "zombie apocalypse."

Thx! Good show. Seen the alien ships. A/S engineer. They don’t use gravitics. Currently reengineering what I was shown and getting sparks of “subspace”.

the thought of our entire planet "wobbling wobbling a bit" is all but comforting

Rama, nice nod!

I like how they incorporated Rama 😊

It's NOT the Aliens?! Then *who probed me* last night? 😱

RAMA ... lol, they are totally trolling everyone. I have the Rama series in my bookshelf, and yes that ship was massive and held entire civilizations as they flew through space as a kind of space ark.

@orange-micro-fiber9740

Жыл бұрын

Thank you. Glad someone else caught the reference

My Friend Grignaarrk Skofftsch said the whiplash going into light speed is brutal!