Why are galaxies spirally shaped?
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Astronomers think that galaxies have spiral shapes because galaxies rotate, or spin around, a central axis creating the round shape. read more
Source: earthsky.org
Astronomers have long wondered why the spiral arms of a galaxy don’t wind up and vanish after a few rotations. Many galaxies have satellites – smaller neighboring galaxies. One theory is that a satellite can keep a larger galaxy’s density waves moving indefinitely. Other processes may help shape galaxy spiral arms. read more
Source: earthsky.org
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