The Earth's gravity keeps the Moon in orbit.
Fact #283
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The telescope expanded understanding of the universe.
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The surface of Venus is hidden beneath thick clouds.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Mercury has no substantial atmosphere to trap heat.
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The Sun accounts for more than 99% of the mass of our solar system.
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There are rogue planets drifting through space with no star at all.
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The light you see from some stars today began traveling before humans existed.
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Black holes can slow time so much that seconds near them equal years far away.
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