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Hey. I've watched many of them online. Through the Wormhole with Morgan Freeman (series), The Fabric of The Cosmos (4 Episodes), Einstein's Unfinished Symphony, Into the Universe with Stephen Hawking ( 3 Episodes).

You can find some Episodes of Through the Wormhole, all 4 Episodes of Fabric of the Cosmos and Einstein's Unfinished Symphony on YOUTUBE FOR SURE.

the history channel has lots of good documentaries offered for sale, Ron Howard just completed a project about americas journey into space. Log online to historychannel.com and check them out. National Geographic, the science channel, Smithsonian Institutes Museaum of Air and Space~ all are online and have extensive catalogs! Look up Ron Howard's (the guy who played Opie Taylor) filmography as a director and you will find the name of his space documentary. TIME/LIFE also has an extensive catalog online. Try looking up goddard space center. Have fun!

http://www.streaming-madness.net/

Everything there basically. There are separate physics and astronomy sections.