The largest known structure in the universe is so big that light takes about 10 billion years to cross it.
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The Moon has no breathable atmosphere.
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Saturn has dozens of known moons.
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The light you see from some stars today began traveling before humans existed.
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The International Space Station orbits Earth roughly every 90 minutes.
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The light you see from some stars today began traveling before humans existed.
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Interstellar objects have passed through our solar system.
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