The event horizon marks the boundary around a black hole.
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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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Time moves slower in stronger gravitational fields.
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Rogue planets drift through space without orbiting a star.
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The universe has no center.
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The Hubble Space Telescope revolutionized deep-space imaging.
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The Milky Way contains regions of active star formation.
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Black holes can slow time so much that seconds near them equal years far away.
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