Really informative video, thanks Brady - I think I've written it before, but it always astounds me how good you are at asking questions.

@DeepSkyVideos

10 жыл бұрын

that's very kind - thanks

Somehow Brady always manages to ask the questions I'm thinking :)

@BeCurieUs

10 жыл бұрын

Ya, he is a great interviewer...most likely because he isn't an expert in any of the things for which he does interviews which helps quite a bit for all of us :D

This is one of my favourite videos on this channel. The way Paul answers questions is both extremely knowledgeable and extremely understandable. I would love an hour-long video with him, talking about anything he wants in astronomy.

@ariessweety8883

4 жыл бұрын

As would I!

Excellent! Thank you, Brady. I was missing videos like this.

Yay, a new video... my astronomy part of the brain was going though quite a drought without your videos Brady. :3

Great show. Interresting questions bring interresting answers...

@DeepSkyVideos

10 жыл бұрын

thanks for watching

Thanks for the interesting video, and asking interesting questions Brady!

Awesome! DeepSkyVideos is easily my favorite Brady-channel.

@DeepSkyVideos

10 жыл бұрын

thanks - but hope you keep watching the others too! ;)

It's always nice to see a video with zero thumbs down :) Thanks again!

@julienferte3795

10 жыл бұрын

Too late :(

@justinmuller6972

10 жыл бұрын

lets hope no-one notices....

1:15 Look! It's the "Fuzzy Photograph of the Loch Ness Monster" Nebula!!

@jrandall15ec

10 жыл бұрын

I thought the same thing!

I'm not an astronomer, and please correct me if i'm wrong (I want to be wrong), but from what I understand, you wouldn't see very much at all if you approached a nebula on a space suit. First, these nebulae are gigantic, we're talking about light-year distances here. If you were "close" to one, there wouldn't be much nebula in your field of view and the amount of light coming into your eyes would be low. When you are very far away, on Earth, all the light coming from the entire nebula can fit on a 10mm window on your telescope. That's why you can admire it's glow. Also, as the Professor said, all that gas is really thinly dispersed. It's surprising it can even be called a gas, but I guess you have to call it something.

@Lavabug

10 жыл бұрын

Depends on the nebula's chemistry and what's lighting it up, it might not be visible light it's glowing in... You can see some nebulae with your naked eye and/or minor assisstence like binoculars or a really low end telescope. Ie: LMC. Some nebulae like tarantula are incredibly hot and dense, most of the gas is ionized. I'm not sure if you would see it with your eyes since I think it shines mostly in UV and x-ray, but you would definitely feel it if you were close enough...

@QwertyuiopThePie

10 жыл бұрын

Lavabug The LMC's not a nebula, but the Orion Nebula fills that example slot.

It's been a while! But good to have it back

@DeepSkyVideos

10 жыл бұрын

thanks - we've got loads more to tell you all about!

Brady, my deepest thanks to you and your colleagues for bringing these amazing objects to us. I think I've watched every video you've made on these channels and I'm extremely proud to support your habit of making informative videos (Patreon plug here). I don't know if you do it or not, but please give my (our?) thanks to the Professors for their time and energy in being so downright good at their jobs. It makes me want to go back to school, which is saying something! All the best, Matthew. P.S. When are we gonna get an astronomy corner on HI? =)

Great Video! I really enjoy listening professor Crowther. Definitely a great addiction to the channel. Thank you Brady!

Brilliant question, Brady. I never realized I was curious about the same thing until you asked it. Hope to see more!

@DeepSkyVideos

10 жыл бұрын

always more coming - we have to get through the whole Messier catalog!

yeah a new video by Brady

Nice to have you back. Thank you for the interesting video.

Excellent stuff. You learn something every day, and this is today's!

Lovely, nice clip again. And good questions. Keep them coming, please!

I really enjoy learning about the universe. Thank you for sharing. Marie

Missed DSVs, nice one!

I like the thumbnail.. and the video!

This is so good. Great questions, fascinating answers.

@DeepSkyVideos

10 жыл бұрын

thank you

Great video, very insightful!

Beautiful. Just beautiful.

There is a point of knowing when a star starts thermonuclear reactions. It then starts to emit neutrinos long before the light reaches the surface. However, that is impossible to detect, unfortunately.

Somehow the picture of the Swan Nebula at 1:15 reminds me of the drawing of the elephant in The Little Prince.

@Beer_Dad1975

10 жыл бұрын

Do you mean after it's been swallowed by the boa constrictor?

@unvergebeneid

10 жыл бұрын

Matthew Sharpe Yep :)

@NoNameAtAll2

5 жыл бұрын

The hat picture*

Lol, I said "So there's no ignition point?" a few seconds before Brady.

I like that galaxy... And *Omega* Nebula sounds like the best name, imho ;)

Which book is the professor referring to at 0:54 ? Absolutely enjoyed the video. I watched, adored and sketched the swan nebula only yesterday from my 12.5” Dobsonian telescope.

Great video 👍

Interesting. I also thought that there was an ignition point.

Hydrogen above around 3,500deg C is plasma, it's ionised. How come a photon that can ionise hydrogen needs to carry more energy than that?

Nice!

Please publish a video about M8!

I know I don't have the best internet connection, but how come only deep sku videos lagg so hard on 480p.... :(

Why is this Professore Paul Crowther from University of Sheffield when all othar proffesores are from University of Nottingham?

I know this was posted and last commented on a while back but I hope you see this, Brady. My bad for not coming sooner, I knew it was here. I question the answer you got about new stars not being detectable. What about Herbig-Haro stars? I thought those were thought to be clear signs of new stars.

Looked more like a lobster. Just great.

Brady I beg you , Can you do more videos about space ? Thanks ! PS : I watched every videos on Your channels :)

@DeepSkyVideos

10 жыл бұрын

ha ha - I love making space videos... but the others are fun too!

Where's the Omega 4 Relay? =(

More vids more atronomy please

I have a question. I know that stars of a certain mass will, at the end of their lives, become black holes. My question is, what prevents them from collapsing into one straight off if all the mass necessary is already there? Does it first have to go through its hydrogen reserves to synthesise the heavier element helium while decreasing in volume, hence increasing in density in order to trigger the collapse? Is that the reason? I guess the same question also applies for other stars becoming white dwarfs and so forth. I'd really appreciate if someone could clear that up for me :)

@kennethflorek8532

10 жыл бұрын

Heat, the random motion of particles. Particles bounce off one another at a sufficient rate that they are sort of juggled into positions far enough away from each other to keep the density from increasing. It is when the energy produced by fusion gets sufficiently low that density increases. There are all sorts of fusions going on in stars simultaneously, but as more of the nuclei get bigger, they reach a point where not enough energy of motion is produced to hold the particles far enough apart to overcome gravity.

@Lavabug

10 жыл бұрын

1. They don't collapse beyond a certain point because the gas pressure from the ongoing fusion in the core balances out the gravitational force, thus stars remain in fairly stable hydrostatic equillibrium during their time on the main sequence. 2. Yes, but it will only continue collapsing if the mass/weight is high enough to crush the core enough to go through additional fusion epochs producing heavier elements. Interestingly, when the core hydrogen is depleted, the core shrinks while the outer layer expands into a red giant as H->He fusion occurs in the outer layers(and the product sinks to the core), so the overall volume of the star increases. This is called the 'mirror effect'. 3. WD's are the helium (or carbon, if sufficiently massive) core of red giants after they're done blowing out their outer layers (forming a planetary nebulae) from the red giant phase. To get NS or black holes you need even greater masses to trigger a core collapse. The wiki on 'stellar evolution' is a great place to start.

Amazing what people have figured out about our world/universe.

thaks Brady!

1:16 - Конечно, название Лебедь намного красивее и очень подходит для такой прекрасной туманности, а название Ωμέγα - пусть останется в математике.😊. Всем астрономам - здоровья и удачи❤❤❤. За перевод на русский язык - отдельное спасибо, а то эти "носители языка" так плохо говорят - то слова глотают, то...в общем ничего непонятно... 🤭.

Wonder how meany earths there have been. (what we call earth) Yah know, in movies they go this has all happened before & due to the size & age of the universe, it would be daft not to believe it's not possible.

@Amilakasun1

10 жыл бұрын

None cause lots of stars together in cramped space not a good place to live.

@axelord4ever

9 жыл бұрын

Amilakasun1 They are 'relatively' close but not effectively next to each other. Stars formed out of nebular nurseries usually move out along with a small accompanying halo of dust and gas. By the time they are distinctly out the nebula, ur-planets can already be well present. I think JC up there is asking about what generation our sun is. If I recall correctly, I think the sun is a third generation star. So, not born out of the primordial haze nor out of the material from a star that formed from that but one step further.

@dhvsheabdh

9 жыл бұрын

JCRocky5 You can't know. There have been plenty of times where the lottery has not been won despite the sheer number of entrants, so why is it guaranteed that there are Earth-like planets? (Earth-like being the life-contained planet we know today, not the primordial planet)

Huh, so there is no visual difference between the glow from the accretion of the star material and the light from the nuclear fusion?

Is our sun part of any sort of star cluster?

@andrewkovnat

7 жыл бұрын

Yes, but it has long since evaporated into nothingness.

"So the sun in it's wild and reckless teen years would never have had the honour of illuminating a nebula like this." That sounded a bit dodgy to me.

A few microns does not sound like longer wavelengths. Someone please explain this if I'm wrong...

@TedManney

10 жыл бұрын

A micron is a micrometer, or 1000 nanometers. Visible light falls in the 390-700 nanometer range, and he mentioned "1 or 2 microns" which would translate to 1000-2000 nanometers, which is longer than the wavelength of visible light.

how about videos on the constellations?

the nessie nebula

He looks high in the thumbnail.

I want whatever drugs astronomers are taking! I can't make out anything except for a bunch of stars & glowing gas! :-/

k

I prefer the name Swan Nebula too :-)

Hmm, looked more Nessie than swan lol

inb4first

@unvergebeneid

10 жыл бұрын

Did you fall on your keyboard? Are you alright?