Cosmic microwave background radiation is evidence of the early universe.
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There are black holes at galaxy centers.
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The International Space Station orbits Earth every 90 minutes.
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The center of the Milky Way contains a supermassive black hole.
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Black holes can slow time so much that seconds near them equal years far away.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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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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