Fossils in the Galaxy: Globular Clusters - Ask a Spaceman!

[@davidshoyt1979]

I’m a public educator for astronomy at the Daniels observatory in Greenville. I really appreciate your delivery and presentation style. Awesome work!

[@ETTe316]

Looks Awesomely Amazing!

[@alansnyder4104]

I loved this topic. The fact that globular cluster's don't contain dark matter is super interesting and seems like a clue to what it is. Like after we find out, we will look back on this and say of course. A topic I would like to see covered is, what might JWST see when it looks to the early universe to see the period of galaxy formation. Something like, "If it see A, thatm means this theory is more likely" or "If it sees B, that theory is more likely". And then just for fun some reader polls about A vs B. Then in a few years after the results are in we can revisit that episode.

[@MrMrduke1975]

So glad I found you! Loving your content!

[@0Marbles]

Loved it. Love the topic. Love the mystery. Great presentation. Thank you very much.

[@LordBitememan]

“The Florida of the galaxy. . .” . . . Globular cluster man kidnaps, married alligator.

[@shaundubai8941]

I like the new format

[@wanderinginterneter8203]

Hi. Im a big fan. I watch "How The Universe Works" and i also want to be an astrophysicist

I enjoy your videos since you were just talking I'm front of the camera. But this video is awesome!!

[@xadahgla]

6:54-All sorts of what?

[@garrycollins3415]

I'll need to watch that again. It's like I almost understood it.

[@drex23100]

Could they be absorbed galaxies?

[@wcsxwcsx]

There's one thing I don't understand about globular clusters. If their stars are so densely packed and they're so old, and they don't seem to be rotating like a galaxy, then why haven't the stars felt the gravitational effect of all the surrounding stars and collapsed in toward the center of the cluster? To keep them apart, they would have to be in a rotating disk like a galaxy. A static globe shape would seem to be impossible.

[@venoltar]

They are definitely moving relative to each other, they just don't seem to be getting ejected very often (Probably due to the overall gravity of the cluster itself). The only thing I can think of is that collapse/disk formation is slowly happening, it just needs more time. Space is pretty big after all, and it is surprisingly hard to get two stars to actually hit each other even when you smash two entire galaxies together.

[@BartJBols]

They are, they just arent there yet. There isnt a lot of friction in space between stars, and distances are vast beyond comprehention, so its a very slow process but we are in effect watching everything fall into a chaotic spiral to the center. Also remember, galaxies can spin fast without spinning themselves to pieces because of dark matter. globular clusters dont have that, so while they spin far slower they probably have the same level of centrifugal forces on them.

[@mikelodge6394]

The disk shape comes from friction during collapse of gases and dust clouds. Two spiral galaxies colliding end up elliptical (kinda like globular) because no friction between the stars. So I guess the globular and not pancake shape is also another clue as to globular cluster origins

[@Ben-g4w5j]

We live in an electric Universe.

[@cycadiguess]

​@@Ben-g4w5jexplain gravity

[@ZeroOskul]

I love this show! Paul kicks it hard!

[@michaelgoble8928]

Hello dr sutter. If dark matter was the result of a decaying black hole, by whatever means, and globular clusters don’t really have dead stars and likely very few if any black holes as a consequence,,, and considering globular clusters do not have dark matter suggesting when they formed it wasn’t prevalent like it is today when they formed meaning maybe it was created sometime after, and only where stars formation and deaths were occurring. Not the GC. It would then seem likely to me that the dark matter phenomenon would be explained by dispersal of black holes or unbound dark hole matter. I’m sure it’s been thought of but I’m curious. Thank you for all you give us! Cheers.

[@user-hu3iy9gz5j]

Globular Clusters are fun

[@michaelpettersson4919]

Failed to form a galaxy because they just didn't have enough mass... Then and advertisement kicks in proclaiming "Just can't get enough, just can't get enough" in a jingle... 😄

[@Crushnaut]

Random question. If as the universe ages the local strength of dark energy increases, to the point of being able to pull apart atoms, neutron, etc does it ever get so energy dense that the energy density is now the same as the beginning of the universe?

[@GreatGranger]

When is your second book coming on Audible?

[@dougieh9676]

Have you looked into temporal mechanics? It has an interesting explanation for dark matter and dark dark energy.

[@paulharland7280]

That's really cool probably one of those things humanity will only ever be able to observe at extreme distance though. We'll be lucky to make it to the nearby stuff. I wonder if solarsail craft traveling along the gravitational focal lines of the sun would get a boost from the focused light of distant stars. Maybe in the future humanity will use the gravitational focal lines of stars like we did trade winds.

[@edwardhinton1615]

I always thought of them as failed galaxies.

[@noksenwangsa916]

Shouldn't older stars have more metals brewing within because fussion had been going on for long enough time to burn out hydrogen into heavier elements by now ??

[@waferty6027]

So....there is something strange in the neighborhood ?

[@waferty6027]

Who ya gonna call ?

[@BartJBols]

what if globular clusters are just 'galaxies that happen to not have dark matter', the forced inclusion of dark matter in galaxies seems arbitrary and counter productive.

[@wcsxwcsx]

Here's another question: How can globular clusters have no dark matter if they're embedded in galaxies that do have dark matter?

[@jamesharmer9293]

They don't have planets? Asimov says otherwise in his classic short story Nightfall...

[@redketchup356]

If Globular clusters are within the Milky Way ... can a Galaxy "make" and "give birth" to other galaxies ? (like a human will make babies) or (a bactery duplicate itself) ? Can a galaxy make over time, more galaxies ? maybe this is why globulars fail to become galaxies ?!? they "are part" of our galaxy :P

[@augustus7923]

This is beautiful!! Boost your stats > P R O M O S M!!