The COBE satellite in 1992 detected temperature variations in the cosmic background radiation, confirming Big Bang models.
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Cosmic rays constantly bombard Earth from space.
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Project Blue Book investigated reports of unidentified flying objects.
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The light you see from some stars today began traveling before humans existed.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The observable universe is about 93 billion light‑years wide.
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There are rogue planets drifting through space with no star at all.
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