Oh boys, what fun couple turns. Morul has now very serious Need for Steve.
Well, not really. It depends on a lot of factors. Mainly on him really being above a planet, because this could be a hallucination or other effect.
If he is in orbit above Kano, then he simply needs to call for a shuttle.
If he is falling to Kano and Steve can't get to him in time, then he simply needs to enter voidspace, swim a bit to slow down and exit. Do this enough times and he can survive re-entry. Or maybe just keep swimming in voidspace until he is going slow enough for Steve to catch up to him. Unless Timmy shows up.
If he is in orbit above another planet, then he is going to have to search for any sort of space station or satellite and hope he won't get captured by any UWM-alinged workers. Then he just has to contact Steve somehow, maybe use the Internet.
If the planet lacks any sort of space station or satellite, then he can try falling to its surface. MK suits can recycle air for days and he should have at least some food with him in his backpack.
If he falls to an uninhabited or worse an uninhabitable planet, THEN he's pretty much on his own. However, even in that case, he should have appeared above this planet for a reason. So if he searches, he should be able to find some sort of sign of human or alien activity. That could be his ticket out of there.
The most obvious thing to check would be radio signals. If he's lucky, anything worth anything around him should be emitting radio signals of some sort.
Or instead of using the voidsuit, he could use his manipulator to move around, provided he gets enough dynamic bonuses. Or he could use the space compression effect of voidspace in conjunction with his manipulator to move around really fast.
Really, as someone who has been trapped in a spaceship falling to the surface of a planet, I can attest that until you are dead, there is a great deal of things you can do to stay alive. Of course, having Steve there to help is always a great plus.
But if worse comes to worse, you can always play with Timmy in the name of Science.