Master of Orion I & II
Alpha Centauri
Starflight
Dune II
Other great sci-fi/space games recommended.
x-com
star command: revolution
star control 2
Alpha Centauri is the best game ever made.
Also play the X series. Only the first one is /vr/ but they're all worth playing except Rebirth. Other older space games worth playing are the Freespace and Wing Commander/Privateer series.
Buck Rogers