You can fit all the planets of the solar system between Earth and the Moon with room to spare.
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Project Mercury was the first U.S. human spaceflight program.
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Time moves slower in stronger gravitational fields.
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The Mars Pathfinder mission tested new landing techniques.
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The Earth orbits the Sun once every year.
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The Earth orbits the Sun at about 30 kilometers per second.
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The Milky Way is on a slow collision course with Andromeda.
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The Space Race led to the Apollo 11 Moon landing in 1969.
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Time moves slower in stronger gravitational fields.
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