I Didn't Know That! artwork

Measuring cosmic distances?; Galileo and telescopes; A holographic universe?; Venus' atmosphere

I Didn't Know That!

English - January 04, 2011 17:00 - 42 minutes - 19.8 MB - ★★★★ - 92 ratings
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Measuring cosmic distances?; Galileo and telescopes; A holographic universe?; Venus' atmosphere