Space is completely silent because sound requires a medium to travel through, and space is a near-perfect vacuum.
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There are black holes at galaxy centers.
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The observable universe is about 93 billion light‑years wide.
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Saturn's rings are made primarily of ice particles and rocky debris.
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The Kepler mission searched for Earth-like exoplanets.
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Black holes can slow time so much that seconds near them equal years far away.
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Gamma-ray bursts are among the most energetic events observed in the universe.
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A day on Mercury lasts longer than a year on Mercury.
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The observable universe is about 93 billion light‑years wide.
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