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doit_the_clown doit_the_clown
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7 years ago
Collisions between galaxies
A)   occur only very occasionally to produce spectacular supergalaxies with many new stars within them. Only one or two examples have been detected so far.
B)   are occurring all the time, all elliptical galaxies having resulted from such collisions. These collisions have cleared out all the gas and dust from these galaxies.
C)   never happen since galaxies are so far apart in our universe.
D)   can and do occur relatively frequently over cosmological times.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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7 years ago
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