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What happens when two galaxies approach each other? A. They form a black hole.
B. They merge because of the strong gravitational pull they exert on each other.
C. They shred each other into smaller galaxies.
D. They form a supernova.
E. They repel each other away because of their strong gravitational pull.

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What happens when two galaxies approach each other? A. They form a black hole.
B. They merge...
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