A day on Mercury lasts longer than a year on Mercury — one rotation takes 59 Earth days, but its orbit only 88.
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Mercury has extreme temperature differences.
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Asteroids vary widely in size and composition.
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The International Space Station orbits Earth every 90 minutes.
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The Earth orbits the Sun once every year.
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The Earth's rotation causes the Sun to appear to rise and set.
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The light you see from some stars today began traveling before humans existed.
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