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In comparison to the world we're familiar with, very, very empty. Consider this: someday M31 in Andromeda and our galaxy, the Milky Way, will smash into each other. Though each has over 100 billion stars and possibly a trillion planets, there's a better-than-even chance not a single pair of worlds will collide; things are that spread out. Moreover, that's the space WITHIN the galaxies; the INTERgalactic space is even thinner than that.

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11y ago

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