Space is expanding — distant galaxies move away from us at speeds proportional to their distance.
Fact #6583
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Time moves slower in stronger gravitational fields.
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Mercury has extreme temperature differences.
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The Earth's gravity keeps the Moon in orbit.
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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 gravity affects ocean tides.
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Mercury has no substantial atmosphere to trap heat.
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