The Kuiper Belt contains many icy bodies beyond Neptune.
Fact #1619
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Asteroids vary widely in size and composition.
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The International Space Station orbits Earth roughly every 90 minutes.
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Black holes can slow time so much that seconds near them equal years far away.
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A day on Mars is slightly longer than a day on Earth.
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The Earth's gravity affects the movement of tides.
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Neptune is known for its deep blue color.
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Mercury has no substantial atmosphere to trap heat.
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Neptune appears blue because of methane in its atmosphere.
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