What's the big deal about flat rotation curves?? 🌌
ฝัง
- เผยแพร่เมื่อ 19 มิ.ย. 2024
- The flat rotation curves of galaxies were a HUGE discovery for astronomy, and they are one of the most compelling pieces of evidence for the existence of dark matter. But why and how? Come along today and learn!
Find me: galaxy.nora-bailey.com/linktree/
00:00 welcome!
00:37 what's a rotation curve?
02:48 measuring rotation curves
06:45 rotation curves and dark matter
10:02 but what about...?
Music: www.purple-planet.com
#astronomy #darkmatter #space - วิทยาศาสตร์และเทคโนโลยี
New subs unite!
Fraser Cain gave you a shout out.
I watch a bunch of astrotube, and I never understood this term until now. Thanks!
by the way, you need more videos. you are way too good at this to not have more videos!!!
this channel can definitely go places.
Working on it! Just need about 10 more hours in every day 😭
great video and great explanation, i especially appreciated you not shying away from using equations and plots yet still dumbing it down enough that someone smart yet still hasn't heard of the concept can understand. I think you've got potential to be another great youtube science educator like veritasium, smarter every day, physics girl... keep up the great work! 🌌
Thank you so much, glad you enjoyed it! 🧡
@@NorasGuidetotheGalaxy the longer your hair the more I want to braid your hair.
Great Video! Thanks @Frasercain for the recommendation! You broke that issue down so I can understand it easily! Thank you!
Brilliant video, learnt a lot as always, I appreciate all your work in the editing.
Thank you!
Nora I caught up on some of your stuff and thus today I learned what a rotation curve AND a syzygy is! Excellent job with this stuff.
Thank you! Education + enjoyment, I love to hear it!
That was such a good description! Great job!
Great explanation of something I've never heard of! Thanks!
A lucky day when you get to learn something new 😁😁
I am so glad I found your channel (via your bsky account) - this science stuff fills my brain with usefull information during dull work weeks. 😂
Same, here via Bsky.
Woohoo, I'm glad too! Welcome!
I just wanted to thank you for your videos. They've been keeping me busy during the flu. I'm a chick and ❤ absolutely anything to do with space 🌌🚀❤ so I've been scouring TH-cam, and I love how accessible you make the information to the everyday person.
Thank you!! I love to hear that and it's awesome to have more women around here 😀 Hope you feel better soon!
Great. You managed to compress 6 (?) llectures into 1 video and make it understandable.❤
Wow, that's a great science video! Love that passion and energy!
this channel seems nice :) the concept of rotation curves is simple enough, you have some matter distribution in a galaxy leading to a gradient in gravitational potentials at some radius, giving a definite set of changes of trajectories at that radius, you grab the old Einstein field equations and you put in a roughly correct blob of matter and energy and from there it is pretty simple to see whether the blob of matter and energy is enough to account for the derivatives spatially of the trajectories observed. and the spatial derivative of a trajectory in space is just change in momenta along it, not that difficult, although it isn't that uncomplicated to calculate.
The known, fundamental phenomenon of dilation (sometimes called gamma or y) explains galaxy rotation curves/dark matter. Mass that is dilated is smeared through spacetime relative to an outside observer. It's the phenomenon behind the phrase "mass becomes infinite at the speed of light". Time dilation is just one aspect of dilation, it's not just time that gets dilated. A graph illustrates its squared nature, dilation increases at an exponential rate the closer you get to the speed of light.
Dilation will occur wherever there is an astronomical quantity of mass such the centers of very high mass stars and the overwhelming majority of galaxy centers.
The mass at the center of our own galaxy must be dilated. This means that there is no valid XYZ coordinate we can attribute to it, you can't point your finger at something that is smeared through spacetime. More precisely, everywhere you point is equally valid. In other words that mass is all around us.
Dilation does not occur in galaxies with low mass centers because they do not have enough mass to achieve relativistic velocities. It has recently been confirmed in 6 very low mass galaxies including NGC 1052-DF2 and DF4 to have no dark matter, in other words they have normal rotation rates. This also explains why all planets and all binary stars have normal rotation rates, not 3 times normal
Thanks : you linked a few concepts , and explained them wonderfully 📚🌌
Thank you! Very clear explanation!!
I’ve heard that some very recent findings show that modified Newtonian gravity fails to conform with observation so it seems to be out of the running.
Excellent presentation!
I feel like a bad friend I am just now getting around to catching up on your TH-cam channel 😅 great stuff ❤
Ha well the good news is that it's always there no matter the time :)
Awesome! Great video!
Thanks!
Awesome vid
Great Work! ^.^
Thanks. ❤❤
i haven't even heard of flat rotation curves so i'm confused all around :)
Hopefully a little less confused now 😅😅
Great video!
Thank you!
👍👍👍
wow, great video. i gained braincells.
Hey Nora! Great video! :) I had a quick question though. I may be wrong about this, but it seems like so many times I've heard about the orbit lengths of exoplanets, it's always extremely short compared to our own solar system's planets. Is this true, and if it is, why does this usually happen this way? Or is it the same pretty much everywhere and planets can still take over 365 days for their year etc. etc..? I've heard some exo's have transit periods of 11 days, or 5 days, or 35 days, etc.. That seems super short right, or am I missing something? Sorry about the wonky wording and stuff I am just a layman, haha. Take care and thanks for the cool videos!
Great question! Yes, a lot of exoplanets have really short orbits, especially compared to the planets of the solar system. This is because for the most common detection methods, it is a lot easier to detect exoplanets that are closer to their stars. It's a detection bias!
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Hi mam, this video is great,
And i am a final year ug student from kerala(India), and for my project i have also decided to do the experiment on this topic, as our seniors have already made a special antenna for galactic curve observation and our sir asked us to observe the properties of it and do the hydrogen line experiment
Mam, if you are interested in giving us small guidance for this can i get your email id to contact you, if possible....