Supernovae can briefly outshine entire galaxies.
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The observable universe is about 93 billion light‑years wide.
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The observable universe is about 93 billion light‑years wide.
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The light you see from some stars today began traveling before humans existed.
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The observable universe spans billions of light-years.
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Asteroids vary widely in size and composition.
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The Earth is not perfectly round.
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The Milky Way is on a slow collision course with Andromeda.
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The light you see from some stars today began traveling before humans existed.
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