“ Graphene wafer coverage I wonder if it is really necessary to cover the entire surface of a wafer with a single sheet of graphene. For decades... (read full comment) ” 

Posted on November 18, 2008 at 12:33 PM EST

“ phlyerphil, you are indeed missing something very large -- the sun, and its gravitational attraction. Solar sails can be used to increase orbital... (read full comment) ” 

Posted on July 24, 2008 at 3:13 PM EDT

“ When comparing system impact, end-to-end efficiency should be considered. The ground-based power collectors used in a space-based solar power... (read full comment) ” 

Posted on October 29, 2007 at 4:22 PM EDT

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