Gamma-ray bursts are among the most energetic events observed in the universe.
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Comets orbit the Sun in elongated paths.
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The Milky Way is estimated to contain hundreds of billions of stars.
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The Moon's surface temperature varies dramatically.
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The Earth orbits the Sun once every year.
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The observable universe is about 93 billion light‑years wide.
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The Milky Way is just one of billions of galaxies in the universe.
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The light you see from some stars today began traveling before humans existed.
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