The universe is so large that light from most of it will never reach Earth.
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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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Mercury has extreme temperature differences.
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The observable universe is about 93 billion light‑years wide.
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Rogue planets drift through space without orbiting a star.
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The observable universe is about 93 billion light‑years wide.
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