I love this style of music.
Saafi Brothers (Supernatural and Midnight Children in particular), Shulman, Solar Fields, Zero Cult, Hibernation, Invisible Allies, Phutureprimitive. All of these are great psychill artists.
For spacey sci-fi/chill sort of stuff that doesn't quite fit that mold...Bola (the album Soup especially!), Arovane, Esem,
Dryft, Quench, Plaid and the father of sci-fi synthery Jean Michel Jarre.
I've got a lot of stuff like this, so anything that jumps out in particular let me know and I'll find more in that vein.
Might as well link this mix I made. It's kind of in the same style:
http://www.filedropper.com/atmosphericspaces