Maybe have more things that are able to be found on planets? Like a random encounter thing? Right now there is only really two reasons to even go near a planet, 1. Satellite's and 2. S.O.S signals. There is no need to go to a planet to get crystals, you can get a lot of crystals just by hanging out by an asteroid field. Junk as well.
Cool! Or at least maybe give the S.O.S a little more meaning. Like you rescue a alien and get 15 xp or 50 crystals or 40 junk. That way it gives you a reason to rescue them and you actually get something in return.