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Good question – Does the universe expand forever, or contract and expand in an infinite series of big bangs?

by Marshall Brain

Does the universe expand forever, or contract and expand in an infinite series of big bangs? We don’t know yet, but here’s how we will find out:

Either way, here is a related question because we know that our galaxy is expanding right now:

How do galaxies collide? If things started in the Big Bang – moving away from every thing else – what would cause a mass the size of a galaxy to change direction and move into another galaxy?

See also: When galaxies collide

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