 If you liked
ST&RS
|
 ...then you might like
Star Children
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While ST&RS is about going to Mars to meet aliens, Star Children is about going to Jupiter to possibly rescue the crew of the first manned exploration mission to Jupiter that suffered an accident some years prior. Both series follow the main character through astronaut training. ST&RS is more futuristic sci-fi while Star Children sticks to more realistic technology. I, for one, love the somewhat neglected niche genre of astronaut manga, and these series are both quite good and deserve more attention (as of this writing, Star Children is on the list of only 78 members)