Quasars are extremely bright objects powered by supermassive black holes.
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Project Blue Book investigated reports of unidentified flying objects.
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The Moon's gravity influences ocean tides.
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Black holes can slow time so much that seconds near them equal years far away.
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Black holes can slow time so much that seconds near them equal years far away.
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Project Mercury was the first U.S. human spaceflight program.
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Gamma-ray bursts are among the most energetic events observed in the universe.
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The Vostok 1 mission marked the first human spaceflight.
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The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
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