Gamma-ray bursts are the most energetic explosions in the universe, briefly outshining entire galaxies.
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The universe has no center.
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The Milky Way is on a slow collision course with Andromeda.
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The Vostok 1 mission marked the first human spaceflight.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe is about 93 billion light‑years wide.
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The Voyager Golden Record was sent into space containing sounds and images from Earth.
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Project Blue Book investigated reports of unidentified flying objects.
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