The universe is infinite..and there are millions and millions of civilizations out there

Absolutely Amazing...!

Sorry, everyone, but David won't be joining us. He didn't like the intro.

Primordial matter was almost all hydrogen and helium. Our solar system was formed from "blown up stars" (only a bit of a simplification) and the matter from the fusion in those stars. Nebula consist of lots of H and less of, but still lots of, other elements. They're formed (roughly) from colliding ejecta from the older stars. So, there will be currents. That is, not necessarily spherical. BUT. Even a spherical distribution of gravitationally bound interacting (colliding) particles with completely random velocities will evolve into a disk. (The symmetry is broken in a statistically random direction (around the center).) Why? Well, think of a crowd. Is it easier (i.e lower energy) for each individual to move randomly, or will it be (lots!) easier for the crowd to settle on a single direction and move together? Similar logic applies to particles (as long as other directions are penalized - like by being more likely to crash into one-another.) BTW, awful introduction in video. I never had a lecturer that stood up in class and read the textbook, but I have had the unfortunate experience of sitting thru presentations in which the speaker just repeated, verbatim, the Power Point slides' text. In the first couple of minutes we learn what? That the September talk doesn't yet have a title? ?? Really? Yeah, definitely critical to put that up front rather than at the end.(/sarc) Anyway, I can't complain too much because I stopped watching at that point. MC didn't even tell us what the current lecture was about!

I heard that Doug made planetary systems.

New born Galaxies? no very old Galaxies at 13.800 million of years. JW destroy the "big bang" speculation.

my first comment, and gotta say best video i've watched so far

All exoplanets give us whetting of our technology to more easily & thoroughly 'see' supposedly livable planets.

Why "Newborn stars are surrounded by disks of gas and dust", not a sphere of dust given the presumed randomness of the primordial matter?

Lovely!

why the stupid fcking music? did you actually think I'd sit through this crap?

Excellent, thank you so much. Helped and was easy to follow. 😂

In relation to repairing Hubble, my opinion, they should take one of the shuttles out of retirement for one last mission. Any of the three has the capabilities of what Hubble needs to be repaired. If NASA wants to keep Hubble in operation, then this would be the step to take.

Wow. How amazing.

Looks like two ppl fighting

The only way I could see the difference was to use

I cannot believe that the hubble telescope can see other galaxies.This is just amazing

Dark matter yes but not dark energy which doesn’t exist! Flickr George Kanev search Abell S1063 NASA Hubble space telescope

so many rouge plannets and stars, so many life destroyed

Thanks for all this great information

very nice easy-to-understand explanation of Dark Matter, thanks chaps

There's only one error in this video: if an observer flies this fast and far they should see the nebulas and stars relative shape and position change. We see the sky objects back in time, and if we come closer, we should see them change.

🔥🥺

Amazing

Fantastic

Super

Really cool

Awesome

Niice

Incredible

Wow

👍

Spectacular

Fantastic

Very good

Awesome

Love it

Wow

Cool

Nice

masyaAllah kebesaran Allah

Wow amazing Space Exploration

What is the nebula in the thumbnail called?

Nasa and the others did a great job capturing this...

Andromeda finally got milk after 4B years😂

Space Mexico.