Thanks for the heads up on Hidria Spacefolk, I'm downloading the EP songs now.
Somebody else mentioned Porcupine Tree, their early work is some excellent space rock. I just picked up a copy of the remastered "The Sky Moves Sideways", and it is very, very good. Their more recent stuff is less space, more metal, but still excellent. In Absentia and Deadwing, their two most recent releases. both also come in superb multi-channel mixes on DVD-A discs that include a DTS mix playable on any DTS-compatible DVD player.
I don't know if I'd toss Tangerine Dream into the "space rock" genre, but they sort of flirt with the edges of it. Anybody who likes them should check out the Tangerine Tree releases, mostly live shows that are very nicely remastered, put together by fans. The latest tree #7 takes them up to volume 71, so there's a lot of good material, and it is all distributed as lossless shn files.
Trees 1 through 6 are still available for FTP download at ftp.airstreamcomm.net using anonymous login. The new Tree #7 is up at tt.rondua.de, also using anonymous login. Some of these volumes also turn up on some of the bit torrent sites like dimeadozen if you prefer that method of distribution. Summaries of each volume of trees 1 - 6 can be found at
http://www.voices-in-the-net.de/ under Records -> Fan Releases.