The Voyager 1 spacecraft has traveled farther from Earth than any other human-made object.
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The observable universe is about 93 billion light‑years wide.
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The Moon's surface is covered with regolith, a layer of loose rock and dust.
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Project Blue Book investigated reports of unidentified flying objects.
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The event horizon marks the boundary around a black hole.
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Venus rotates in the opposite direction of most planets in our solar system.
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Mercury has extreme temperature differences.
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Project Mercury was the first U.S. human spaceflight program.
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