The Parker Solar Probe has come closer to the Sun than any spacecraft — within 6.1 million km.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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There are rogue planets drifting through space with no star at all.
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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The light you see from some stars today began traveling before humans existed.
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The Earth's atmosphere protects life by filtering harmful radiation.
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The Earth's gravity affects the movement of tides.
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The center of the Milky Way contains a supermassive black hole.
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The Wow! signal was a strong radio signal detected in 1977 that has never been fully explained.
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