Sagan Planet Walk | Sciencenter, Ithaca NY - discu.eu

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The Sagan Planet Walk is a walking scale model of the solar system http://www.sciencenter.org/saganpw/ 5 comments 6/11/2009 science

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Visualizing Vastness - The New York Times http://opinionator.blogs.nytimes.com/2012/10/15/visualizing-vastness/ 0 comments

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