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This video shows how long it takes for light to travel from Earth to Mars and back again

mercredi 23 janvier 2019, 20:22 , par BoingBoing
At this scale, light moves at a snail's pace.
From the YouTube description: 'This is the distance between Earth, the Moon and Mars with the correct distances but with Earth, Moon and Mars 20 times bigger (so you can see them!).'
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https://boingboing.net/2019/01/23/this-video-shows-how-long-it-t.html
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