Black holes form from collapsed massive stars.
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The Sun will eventually expand into a red giant.
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The Earth's orbit determines the length of the year.
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The International Space Station orbits Earth roughly every 90 minutes.
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The Earth's atmosphere is layered into troposphere, stratosphere, and beyond.
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The observable universe is about 93 billion light‑years wide.
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Venus rotates in the opposite direction of most planets in our solar system.
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