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Carl Sagan teaching school children about the Universe
Collected in celenacrews's videos Sep 17, 2009 -
Explore a model of Earth's yearly revolution around the sun.
Shows rotation of Earth on it's axis as well as rotation around the Sun.Collected in celenacrews's videos Sep 16, 2009 -
Carl Sagan - Pale Blue Dot
Some deep thought for you... Carl Sagan.Collected in celenacrews's videos Sep 16, 2009 -
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celenacrews
Sep 21, 2009