New Horizons revealed Pluto's complex geology — mountains, glaciers, and atmospheric hazes.
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The light you see from some stars today began traveling before humans existed.
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Quasars are extremely bright objects powered by supermassive black holes.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe is about 93 billion light‑years wide.
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The Moon has lower gravity than Earth.
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Magnetars have extremely powerful magnetic fields.
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The Voyager probes have traveled beyond the heliosphere.
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Saturn's rings are made primarily of ice particles and rocky debris.
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