Mercury has extreme temperature differences.
Fact #147
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Saturn could float in water because its density is low.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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The Earth's rotation speed varies slightly over time.
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The Milky Way is estimated to contain hundreds of billions of stars.
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Black holes can slow time so much that seconds near them equal years far away.
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There are rogue planets drifting through space with no star at all.
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The Earth's gravity keeps the atmosphere in place.
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Jupiter has a magnetic field stronger than Earth's.
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