Some galaxies collide.
Fact #2364
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The Moon slowly moves away from Earth by a few centimeters each year.
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Comets are made of ice, dust, and rocky material.
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Black holes can slow time so much that seconds near them equal years far away.
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Black holes can slow time so much that seconds near them equal years far away.
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The Moon's surface temperature varies dramatically.
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The light you see from some stars today began traveling before humans existed.
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Venus has the longest day of any planet in the solar system.
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The largest volcano is on Mars.
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