The Earth's rotation causes day and night cycles.
Fact #185
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The Moon completes its phases in about 29.5 days.
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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The observable universe is about 93 billion light‑years wide.
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Venus is sometimes called Earth's sister planet.
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Neptune is the farthest known major planet from the Sun.
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Neutron stars can spin hundreds of times per second.
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A day on Venus is longer than its year.
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The light you see from some stars today began traveling before humans existed.
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