M55 - Rotating Stars - Deep Sky Videos
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- Опубліковано 27 вер 2024
- Professor Mike Merrifield discusses globular cluster Messier 55 and the rotation of its stars.
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Professor Merrifield is an astronomer at the University of Nottingham: www.nottingham...
PAPER: The internal rotation of globular clusters revealed by Gaia DR2 - arxiv.org/abs/...
More videos with Professor Merrifield: bit.ly/Merrifie...
Professor Merrifield on Objectivity: • Map of the Galaxy - Ob...
Messier Objects playlist: bit.ly/MessierO...
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Video by Brady Haran
Just a little note: We filmed this in 2018 but it got a little "lost" in the edit queue and is only appearing now in 2021.
This Messier series is just amazing, full of information otherwise not easily accessible. Please never stop, once you’re done with Messier, the NGC catalog is waiting for you 😀
With so much drama in the NGC it's kinda hard bein Professor M-i-k-e...
They could just run back through messier catalogue with updated or new studies and finds
Uhh, there are about 8,000 NGC objects.
I always look forward to your videos.
I'll never stop being impressed with how you guys figure all this out.
What a wonderful channel this is, always happy to see an upload :)
Professor Merrifield is always great.
He packs more content density into the videos he does than any other presenter in any science forum l watch. 👍
Great Video!! Enjoyed another Messier Hunt. Keep Them Coming!
Always a pleasure to see another Deep Sky video. I'm curious about the size comparison of a globular cluster to a galaxy. Are globular cluster just would be galaxies that didn't accumulate enough stars?
Have you considered a video on Omega Centauri? Not aMessier object, but a fascinating thing.
Can anyone unpack 1:40 - 2:00 for me a bit? If you didn't see any Doppler shift, wouldn't the _absence_ of Doppler shift actually be evidence that it was disc-shaped? Rather than just leaving you in a position where you can't tell?
That's Exactly what he is saying.
As I understand it (not an astronomer...), the absence of doppler shift could mean that it's either not rotating at all or it is rotating but only perpendicular to us. So we could be seeing a completely spherical object or a disc-shaped object from its "top"
Hard to believe this was only two years ago! Mike's bookshelves are now bare 😭 and y'all have already finished the Messier series and moved onto the NGC. What a fantastic time to be alive 🥳
Globs!!!
Sounded like Prof Merrifield was glad to finally have something interesting to say again about yet another effing globular cluster 😅
Are there any/many examples then of globular clusters that are 100% globular by this definition? Are they all, most, some, or few rotationally distorted or "flateening" to some degree? Is the flattening an ongoing process that all globular clusters undergo or is globularity a stable system in itself?
Is there a common spin direction of galaxies? Most of our planets spin one way. Toilets in the northern and southern hemispheres have spin groups. Does that scale up? And if it did, could anything be deduced from it? If it doesn't, can anything be deduced from that?
Toilets in globular clusters have a random motion.
Only eight to go! Push through!
5 Globular cluster
47 Open cluster
61 Spiral galaxy
72 Globular cluster
84 Lenticular galaxy
88 Spiral galaxy
107 Globular cluster
108 Barred Spiral galaxy
If all the globular clusters were flattened in the plain of the sky, (i may be misunderstanding you saying this) , then either we have a preferred position at the centre of that sphere... or there is a problem with these measurements...
is there a way to separate a cluster from the rest of the universe? how do we define the limit of clusters?
The limits of a cluster is the volume of space within which the clusters gravity overpowers the gravity of the galaxy it is part of.
The universe is calling... Mach has a message for you
@@francoislacombe9071 how do you define the gravity of a cluster? what matter do you take in?
@@ludovicdury7607 Of course there has to be some arbitrarily chosen limit, just as there has to be for the size of a planet (where does the atmosphere end?)
🤗👏👏👏 I need my space!
Everything in the universe rotates. That would include the gas clouds from which globular clusters formed, which mean all those clusters must be rotating to one degree or another.
Well, then prove it.
@@ub1k845 I will let qualified astronomers handle that.
Now consider a perfectly spherical nonrotating chicken
or a torpid sphere held in a relative slow stasis by a singularity at its centre ,
donut galaxy
A few km *per second* is slow 😳
Professor needs to stick his fingers in a light socket to get hair like that other professor.
Here come the flat M55 conspiracists.
wtf did this extremely English guy say?
Him say "go away".
I love prof merrifield, and i love stars
Also gamma rays, petrol, guns and explosions
i like my dumplings globular
Saturn’s polar radius is about 10% less than the equatorial radius. What’s the difference for M55?
Suspect 5% or so.
What about finding globular clusters in another plane/angle positions, now that you discovered they could be flatter from the side
The time between these micro galaxies creation and now seems to be different than we thought, or not...
So what i wonder is, why are globular clusters globular? while galaxies are mostly flat?
That's what Brady's last question covered.
NGC6809, a lovely 8-bit galaxy designed by Motorola.
I love this Messier series. Even if you run out of objects, you may want to remake some of the early episodes which are quite old. Thank you very much for sharing a bit of your knowledge. Cheers!
Brilliant.