Why Are Most Galaxies Spiral-Shaped?
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The structure of spiral galaxies is more complex than we thought. Here's how the laws of physics contribute to the shaping of galaxies. Everything We Know About The Andromeda Galaxy - http://bit.ly/2blkOkG Sign Up For The Seeker Newsletter Here - http://bit.ly/1UO1PxI Read More: What Process Creates And Maintains The Beautiful Spiral Arms Around Spiral Galaxies? I've Been Told That Density Waves Are Responsible -- So Where Do The Density Waves Come From? http://www.scientificamerican.com/article/what-process-creates-and/ ""The basic physics of why galaxies have spirals is known, but the details remain controversial, sometimes intensely so. Spirals exist only among flattened or 'disk' galaxies. These galaxies are differentially rotating--that is, the time to complete a full rotation increases with distance from the center. Differential rotation causes any disturbance in the disk to wind up into a spiral form. The trouble with this simple explanation is that the differential rotation would cause spiral features to wind up too quickly, so galaxies would not look like spirals for any appreciable length of time." How Do Spiral Galaxies Keep Their Shape? http://earthsky.org/space/how-do-spiral-galaxies-keep-their-shape "Astronomers sometimes call this the "wind-up problem" of the spiral arms. It has been observed that the inner parts of galaxies rotate faster than the outer parts. If so, are the inner parts of the spiral arms moving faster than the other parts? If that is happening, then the galaxy would have no choice but to wind up so much that the spiral structure would be thinned out and ultimately destroyed. But we can see galaxies billions of light-years away - as well as those relatively nearby - that have maintained their spiral structure. How?" Astrophysicists Discover Mechanism For Spiral-Arm Formation In Disk Galaxies http://phys.org/news/2016-08-astrophysicists-mechanism-spiral-arm-formation-disk.html "Astrophysicists at the University of Arkansas have discovered a mechanism for the formation of the spiral arms in disk galaxies. The finding was published in the Astrophysical Journal Letters, the journal of the American Astronomical Society. The discovery provides a better understanding for the formation of spiral arms in a kind of disk galaxy known as a spiral galaxy, said Hamed Pour-Imani, a physics doctoral student at the U of A and lead author of the study." ____________________ DNews is dedicated to satisfying your curiosity and to bringing you mind-bending stories & perspectives you won't find anywhere else! New videos daily. Watch More DNews on Seeker http://www.seeker.com/show/dnews/ Subscribe now! http://www.youtube.com/subscription_center?add_user=dnewschannel DNews on Twitter http://twitter.com/dnews Trace Dominguez on Twitter https://twitter.com/tracedominguez DNews on Facebook https://facebook.com/DiscoveryNews DNews on Google+ http://gplus.to/dnews Discovery News http://discoverynews.com Sign Up For The Seeker Newsletter Here: http://bit.ly/1UO1PxI
Comments
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can u give any explanation on multiverse theory and wormhole is actually possible...???
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2:01 That asshole cut her off
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So, no sure answer?
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what if you attached a cord or wire or rope to a satellite
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why the arms have "light" is the questions isn't it ?:)
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well what if the spiral actually just stopped in its tracks? It just ended up frozen that way? I mean since the center supposedly spins super fast, and they say that the arms are keeping up, shouldn't we actually see them spinning in real time? Because there is no way the arms are staying still, yet keeping up with the center, which is spinning super fast.
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thumbs down for no picture. just black.................................................................
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Here's your answer: Black Hole=Plug Hole..
(And that's where we're goin', baby) -
Easy answer: Fibonacci sequence and golden ratio
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That intro was adorable
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Because they are all paintings, not photos!
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haha weve never actually observed another galaxy besides andromeda
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blackhole hahahahahahah
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I believe the reason for the arms is that the universe doesn't care about what humans call physics, and lets galaxies form however they want.
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ROW ROW FIGHT THE POWER!!!
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Cuz the spiral of life, phi, and 42.
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Star Citizens.
Star Citizen.
Elite Dangerous fans worldwide triggered. -
So our galaxy is just a basic bitch?
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wet ball spinning=galaxy.That's my explanation
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I have a question!!
You said that there is a massive black hole in the Center of the gallaxies? Is that possible that gallaxies are like water and "empty" space is earth? I mean: Are all the starts of a gallaxy being suck into the blank hole and will and up in another gallaxy? Or perhaps there is a super gallaxy that is througting stars from it's center??
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