Some black holes spin at nearly the speed of light.
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The observable universe is about 93 billion light‑years wide.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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Black holes can merge and release enormous energy.
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Interstellar objects have passed through our solar system.
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Black holes can slow time so much that seconds near them equal years far away.
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Fast radio bursts are powerful millisecond-long radio pulses from distant galaxies.
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