Why Do We See Spiral Arms in Some Galaxies?
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i love the universe so very much
3 years ago 3
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i heard a theory that spiral galaxies might have been shaped that way by electrical charges and magnetic fields. but who knows
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how long is a peice of string?
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why is Olympus Mons so big?
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if galaxies were billions of years old, then these spiral arms should not be recognisable
crubs83 4 years ago
Yes, actually they would, because spiral arms are inherently *new* features which are continually changing and evolving as galaxies age. We find that younger galaxies generally do *not* have spiral arms yet.
SpitzerJim 4 years ago
how fast do these gravity waves travel?
Tigerbaseball1 4 years ago
The speed of the density wave really depends on the specifics of the galaxy. That's like asking "How fast does a traffic jam move?" The answer is "slower than the rest of the freeway" but we'd call it a traffic jam regardless of whether the cars were averaging 35 mph or 5 mph.
SpitzerJim 4 years ago