The Voyager probes carry golden records with music, images, and greetings — in case they're found by other civilizations.
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The Moon has lower gravity than Earth.
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The Moon's surface temperature varies dramatically.
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There are rogue planets drifting through space with no star at all.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Moon's surface is covered in craters.
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