So, it's theorized that Andromeda will collide with the Milky Way some time in the next 3 billion years...
I don't get how galaxies can collide with each other. What is the cause of their movement? All I can think of is that possibly one of the Supermassive Black Holes of these two galaxies has a greater gravitational pull than the other and is pulling the weaker member toward itself.
That being the case, at what point will the galaxy belonging to the weaker SBH enter the event horizon of the stronger? And what can be expected to happen to the solar systems belonging to the two galaxies when the collision occurs?
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