This is "A Glorious Dawn - Cosmos Remixed" with beats by John Boswell, vox by Carl Sagan, and featuring Stephen Hawking on the special guest verse (basically, playing the Heavy D role).
(thanks to Alice at SkyBluePink!)
(thanks to Alice at SkyBluePink!)
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I'm not sure why, but it made me want to dig this out and listen to it.
http://www.youtube.com/watch?v=GeILGX3nN0U