The Voyager probes are the only human-made objects to have entered interstellar space.
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Black holes can slow time so much that seconds near them equal years far away.
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Interstellar objects have passed through our solar system.
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Cosmic microwave background radiation is evidence of the early universe.
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The Moon has no liquid water on its surface today.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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