Gamma-ray bursts are among the most energetic events observed in the universe.
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Project Mercury was the first U.S. human spaceflight program.
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Gravitational waves were detected a century after Einstein predicted them.
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Neptune appears blue because of methane in its atmosphere.
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The light you see from some stars today began traveling before humans existed.
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The Space Race led to the Apollo 11 Moon landing in 1969.
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