The International Space Station is visible to the naked eye from Earth.
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The light you see from some stars today began traveling before humans existed.
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The Voyager Golden Record was sent into space containing sounds and images from Earth.
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Black holes can bend time.
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The Earth is not perfectly round.
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Some exoplanets orbit two stars at once.
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Dark energy is thought to drive the accelerating expansion of the universe.
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The Moon has no liquid water on its surface today.
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