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A set of F-1 rocket engines from a Saturn V booster will soon go on display.
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Scientists are studying other rocky planets and moons to better understand Earth.
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The storms that gave rise to the Moore, Okla. tornado and others nearby were sighted from space.
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Such a tight three-planet grouping won't happen again until 2026.
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A large coronal mass ejection from the active sun could affect entire continents, scientists say.
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Astronauts, celebrities and the public honored the late Sally Ride with a tribute to her life and work.
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