Project Blue Book investigated reports of unidentified flying objects.
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The Wow! signal was a strong radio signal detected in 1977 that has never been fully explained.
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The Kepler mission searched for Earth-like exoplanets.
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The observable universe is about 93 billion light‑years wide.
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Saturn's rings are made primarily of ice particles and rocky debris.
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The universe has no center.
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There are rogue planets drifting through space with no star at all.
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The Mars Pathfinder mission tested new landing techniques.
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The light you see from some stars today began traveling before humans existed.
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