Graphene makes great solar sail material.

<http://www.newscientist.com/article/mg22630235.400-spacecraft-built-from-graphene-could-run-on-nothing-but-sunlight.html#.VW4WEmDaiPx>

More mundanely, ‘Neat stuff that absorbs sunlight and spits out electrons’ is also known as ‘a solar cell’. I think these folks are missing a huge possibility here by focusing on propulsion. Graphene is cheap to make. REAL cheap. MUCH cheaper than silicon solar cells.

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Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs