User blog comment:Owlfeathers0117/Technologies of BSCN/@comment-25584152-20141123150346/@comment-11135771-20141123155752

Space travel goes under Advanced Rocketry (really, that technology is basically just having made at least one interplanetary ship). The Sublight Drive tech is basically better than average engines for space travel at lower than light speed (given to the SAA and EAF for having the fastest capital flying ships).

Other than that, will add in the next update.