Orbital mechanics, lunar phases, and the Apollo missions, as explained to a 4 year old.
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- Spot on! That's pretty much the way I understand it too.Sep 13, 2011
- 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. :)Sep 13, 2011
- That's so broken. The chalk markings are really just chalk dust, and would float away in space.Sep 20, 2011