M49 - Elliptical Galaxy - Deep Sky Videos
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- Опубліковано 22 жов 2017
- Dr Meghan Gray on Messier 49 (and the distribution of its globular clusters). M49 also known as NGC 4472.
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Video by Brady Haran - Наука та технологія
Dr. Gray, It's so exciting to hear you speak about that "1st job". I have my Ph.D. in another area, and your speaking of your "first job in astronomy" brought back great memories as I did research in Physical/Chemical Oceanography - but actually got my Doctorate as a Clinical Psychologist. But - Earth Sciences, including Astronomy, became a serious hobby and I completed my Messier Certificate many years ago. :)
I am happy that you found that you were on your way to fulfilling that dream that came true.
Dr Gray - You are a real life Astronomer! :)
Thank you Dr. Gray for your sharing on Deep Sky Videos.
I guess even doctors misuse "your". :)
he didnt?
"...and your speaking of..."
I am a criminologist owning a Ph.D. degree and a master in psychology. As I was a teen I wanted to be an astrophysicist, and I have the same experience while listening to Dr. Gray.
He said "your speaking" and not "you're speaking of". He was absolutely right. Just replace "speaking" by "description" and you'll understand.
I love this channel and every video on it. I wish Brady uploaded more deep sky videos. Maybe can we get a series on what each of the people in the videos are currently working on.
Even with me being a simpleton I could watch these video's for hours.
Very very interesting en well explained.
Dr Gray. Nice to see you again.
Dr. Gray! You have been missed!!
I really like DeepSkyVideos!! Please, keep this channel updated!
Always a good thing to find a new Deep Sky Video; and featuring Dr. Meghan Gray is djust icing on the cake.
Another Video with Dr. Gray. My excitement is out of this world! Hooray! :)
Great! Thanks Brady and Meghan!
I feel that she knows what she is talking about. Nice graphics and sound effects too. Information given in a good ratio between scientificity and entertainment. Good video.
So good to see Dr. Gray, welcome back.
Galaxies are my favorite.
I just can't get over how cool they are.
Thank you for sharing more interesting things about galaxies!
Brady, I would love to make a project similar to yours here in Brazil... You're amazing!!! What you built here is fantastic!! Unfortunately, here things are much harder, but I'll try... Thank you for your spectacular videos!!
So this poses that galactic development is sort of analogous to the relationship between stars and planets, just on a higher scale- regions of gas coalesce into stars & the leftovers turn into planets; regions of stars coalesce into galaxies & the leftovers turn into globular clusters
Very interesting observations!
Your videos are extremely helpful. You are a very good teacher. Blessings.
1:56 "Milkay Way"
Oh, I always thought it was Milkay.... Thanks for having my back.
kay
Milky!
We need the extra vowel for the merger with Andromeda. Milkameda (pronounced MIL-kah-MEED-ahh) sounds better than milkomeda (pronounced mil-KOH-meh-duh).
I love these Deep Sky Videos. Is it me, or are do they seem to be coming out less frequently these days?
The obvious idea: Write a manual and call it Gray’s Astronomy 🔭
Thank you so much for this channel and for all the data you mention. A very interesting presentation and excellented done by Dr Meghan Gray.
I still love Dr. Meghan Gray! Awesome video.
Geez, I hope my daughters grow up to be like you! Love your work.
love these vids
thanks - we like making them.
I could listen to Dr. Gray talk all day long!
Everyone should see this one. I've been trying to get some of this for ages, but this video does it.
Excellent video!
+Gabe Sewell thanks for watching
Very interesting subject, almost perfect video.
I learned a lot from this video -- the timescale of clusters, and that Dr. Gray likes purple.
That's Pretty Neat!
I would be really pleased to hear your interpretation about the galaxy-quasar connection of NGC 7603!! Or that would put your job at risk?! Keep up the good work. Cheers.
I really like that star smile in the bottom right at 11:16 :)
Something something anything heavier than helium is metal. Except Lithium, that's grunge.
Neutron star collision video please?????
1:56 "Milkay way" :-D
eXcellent ... I can watch youtube and actually learn something !! Fab.
Awesome
It's alive!
Retracing the epochs, the various theories about integrated state-phases of condensed matter, typically assumes that the evidence is useable because it conforms to absolute mathematical laws and corresponding Geometry in Spacetime, ie this is tacit agreement with the cause-effect modulation of Time Timing in Eternity-now, by default.
So "Time is of the Essence", and essentially, the fact has been obscured by attribution of phenomena to anthropomorphic perceptions and domineering authority.., the normal, natural human thing Science and Mathematics has been adopted to clarify.
This sort of Astronomy, sorting out the differences in ages and evolutionary processes, is fundamentally important.
Really interesting.
+Clinton Gryke thank you
When she said "almost random" made me think that you should make "Messier Dice"
Do we know that Elliptical Galaxies are created by a merger of 2+ separate galaxies? Or is it a theory?
Love the videos! Dr. Gray is my one of my favorite scientists on this channel (I love all of you that contribute, Dr. Gray is the closest to home (Florida) so I have to give her props)!
Carbon? Waaaaay too heavy. Metal it is.
Anthony Peratt has his 2nd edition of "Physics of the Plasma Universe" out. That might give you a clue as to how galaxies form. Also Halton Arp has been looking at galaxies years ago, you might want to take a gander at that some of his work first before doing more videos.
nice
The messier the messier.
No, we don't see any supernova inside globular clusters because they're ancient. All the supernova in globular clusters happened a long time ago.
Meghan! Awesome! :)
The small globular clusters could still be made form, not so old dwarf galaxies if the disk of the Milkyway has a preference for metal-rich stars.
49 is a nice even number.
Apparently, I'm early. Better make a joke... so... you could say that those old-timer stars are not very metal, eh?
... sorry.
I've always wondered, do the metals formed from supernovae just go around as individual atoms, or do they combine with other elements of their type or even form more complex molecules?
In the main they're able to combine while dense enough to form molecules. This results in a lot of 'ices' like water, ammonia and methane and very, very small dust grains. Interstellar space is rough though so a lot of molecular disruption goes on and you can get some very strange chemistry going on. It's only when things condense down into molecular clouds that things become less hectic.
I don't understand why globular clusters can be so old with heavy bright stars in it and having no gas. Heavy bright stars die young. How can they still shine?
I always thought of our solar system as being a "backwater" of our galaxy. But from the picture in this video, our location is rather closer to the center than I thought. We're in the suburbs, but not in BFE. I know the distances are vast, but I always believed us to be way, way out at the end of one of the arms.
Our location in the "Goldilocks" Zone of the Milky Way is not an accident. Too close in and life would be subject to too much radiation, the occasional super novae and tidal forces from the gravity of too close stars could make a stable orbit difficult.
Then the opposite of too far out is there wouldn't be enough heavy elements to make a rocky planet like Earth with enough of the elements critical for life. It is easier to determine how close to the center where stars are too close to each other, but the outer habitable zone is a little harder to determine.
random question. how can you tell the difference between a star that is so far away that the light is red shifted and a star that emits a "redder" light?
Take spectral images and compare with the spectrums of elements. If the peaks in the spectrum are shifted -> the star is moving. If it is at the same place -> it just glows red.
Science always find a way that works, eventually. That is something all the people of the world really need to find out. I'm sure there's at least a billion people out there that think there is no way we can know how far away those stars are, and end up dismissing all of science as bullshit because of it
Thank you :-D
What if it is shifted so much that the spectrums line up?
The peaks of the spectrums do not all have the same height. So you can definitely see which lines correspond to which element. Also the main component of stars are H and He. So you basically just have to look for the highest peaks (the more of an element there is in a star the bigger its contribution to the spectrum) and compare them with the spectrum for H and the spectrum for He.
3:34 Quick, alert Captain Janeway to come to the mess hall for viewing this event
I still don't really understand why elliptical galaxies have no spirals. I can see that if you have 2 nice orderly spirals and collide them, everything could get mixed up and disordered. But as I understand it, the spirals are really waves of star formation propagating through the galaxy. But then why don't elliptical galaxies, after collision, start to form these waves? Maybe it's because these waves only work in rotating discs, and not ellipses. But then why don't the laws of mechanics that turn rotating spheres/ellipses into discs, also work for elliptical galaxies?
Fascinating. So the Milky Way has low metallicity. I didn't know that. So we're old lol
That graph showed the metallicity of the globular clusters orbiting the Milky way, the metallicty of the main Milky Way is higher.
how can I work at an observatory between school and university?
Interesting how Dr. Meghan's accent has evolved over the years :-}
Another great video, but I am not believing the "several decades" comment. Can't be more than barely two!
It's probably too late to ask this, but is proper color vision essential as a professional astronomer?
Major Merger *Salutes*
shouldn't we see frequent supernovas in globular clusters, if they are comprised of very old stars?
So... do astronomers call anything that isn't light entertainment music, "metal"? ;-)
...and does that mean that any supernova remnants that are not H or He are "Death Metal"?
No.
1:24 so it's true: no one learns shit in school.
("I knew nothing")
Are globular clusters simply very small elliptical galaxies? Why haven’t they all merged into their parent galaxies?
1:57 not milkay way it's Milky way!
Are you serious?!
Please solve my problem: If space is three dimensional, then all galaxies are too. If you call M49 "elliptical", then does this galaxy now become 2-dimensional? An ellipse is a 2-dimensional mathematical construct - how can that be the shape of a galaxy?
Presumably it's elliptical from one point of view, the way a pizza is a "circle" when you look at it from above, even though it really has depth (it's a cylinder about an inch tall and two feet across).
Gorillas recognize three kinds of globulars: metal-poor, metal-rich, and coconut
I think I'm infatuated
okay so when Andromeda (starts ) to collide with the milkyway in a like 2 billion years it will eventually become an ancient elliptical galaxy with only dieing stars? in like 10 billion yeras from now,,,,,, thats a bit sad :-( and 10 billion years from now some being will be looking back at milkdromeda (an ancient elliptical ) galaxy and probably think the universe is 13 billion years old ( as the gas and light from the stars we see today will have died out long ago :-( 3.14 at work
Clearly an alien. You look younger now than when you first graduated
If dr Meghan for any reason decides to drop astrophysics, she at least should try storytelling. Her voice and narration are phenomenal. Backed with top knowledge and sharp mind she would dominate science podcasts.
Great channel - but patreon - nah
Milkay Way? 1:56
yay first
As a wise man once said:
"AIN'T NO PLANET X COMIN' CUZ AIN'T NO SPACE CUZ AIN'T NOT GLOBE EARTH"
it's comin alright. It's just underneath our flat earth so we can't see it flyin towards us
wise robot once say "AHahahhhhhaa... Oh wait your serious.. let me laugh even harder AHAHAHAHAHHHHHHAAAAHHAHHHAAAAHHHHAAAAAA!!!!!!"
You should work on your showmanship...the presentation is boring.
Great! Thanks Brady and Meghan!