The Moon's surface is covered with regolith, a layer of loose rock and dust.
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Interstellar objects have passed through our solar system.
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Comets can develop long tails when near the Sun.
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The observable universe is about 93 billion light‑years wide.
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The Milky Way is estimated to be over 100,000 light-years wide.
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The Earth spins at 1000 mph.
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There are black holes at galaxy centers.
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Black holes can slow time so much that seconds near them equal years far away.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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