Of course. The RPG industry was once a beehive of games... Google some of them and you'll find information gallore.
Star wars RPG : old edition had it's own system, new edition uses the D&D rules
Star trek RPG : never played it, never heard much of it
Farscape RPG : based on the TV series
Rifts RPG : weird mix of postapocalyptic dimension-spanning magic-sci-fi version of earth
Gurps Space : Gurps is a generic system, there are some space-based supplements
Space Master : the space oriented spin-off from RoleMaster (ICE publishing)
See also Fading Suns RPG, Traveller RPG, Final Frontier RPG, Alternity RPG, Gamma World RPG, even Red Dwarf RPG
You'll find one that suits your tastes ;-)