The largest volcano in the solar system, Olympus Mons on Mars, is nearly three times taller than Mount Everest.
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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The Moon has no breathable atmosphere.
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The Earth orbits the Sun at about 30 kilometers per second.
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Neptune appears blue because of methane in its atmosphere.
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The Moon was formed billions of years ago.
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The Earth's gravity keeps the Moon in orbit.
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The Milky Way and Andromeda galaxies are on a slow collision course.
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Project Mercury was the first U.S. human spaceflight program.
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