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Orbital mechanics, lunar phases, and the Apollo missions, as explained to a 4 year old.
Jeff Van de Walker's profile photoBen Zibble's profile photoEljay Love-Jensen's profile photo
Sidewalk chalk is also the best way to show how big space really is. We drew a 1-foot earth and then had to walk 60 feet away to draw the moon. Cool stuff. :)
That's so broken. The chalk markings are really just chalk dust, and would float away in space.
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