Collisions Between Galaxies

question 92

Multiple Choice

Collisions between galaxies

• A) occur only very occasionally to produce spectacular supergalaxies containing many new stars. Only one or two examples have been detected so far.
• B) are occurring all the time, all elliptical galaxies having resulted from such collisions. The collisions have cleared out all the gas and dust from these galaxies.
• C) never happen since galaxies are so far apart in this universe.
• D) can and do occur relatively frequently over cosmological times.

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