A year on Pluto lasts 248 Earth years — it hasn't completed one orbit since its discovery in 1930.
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Supernovae can briefly outshine entire galaxies.
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Interstellar objects have passed through our solar system.
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The observable universe is about 93 billion light‑years wide.
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Some stars explode when they die.
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Black holes can slow time so much that seconds near them equal years far away.
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The light you see from some stars today began traveling before humans existed.
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The Milky Way is estimated to contain hundreds of billions of stars.
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A day on Venus is longer than its year.
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