What would happen if the Andromeda Galaxy (a spiral about the same size as the Milky Way Galaxy) collided with the Milky Way?
A) The two galaxies would pass through each other, the stars sailing past each other unharmed, and the interstellar gas and dust clouds would collide to produce a burst of star formation.
B) The two galaxies would pass through each other almost unchanged with essentially no interactions at all.
C) The two galaxies would shatter or even explode, essentially destroying their stars and any life-forms that there may have been (including Earth).
D) All the gas and dust clouds and a great many of the stars would collide with each other, stopping both galaxies and creating a galactic merger.

Question

Quizplus · Accepted Answer

The vast distances between stars in galaxies mean that during a collision, stars themselves are unlikely to collide, but the gas and dust clouds can interact, leading to increased star formation.

What Would Happen If the Andromeda Galaxy (A Spiral About