Algodoo

Press 1 to start. the fuel is attracted to the pink circles, but when it hits the laser, it turns to collision layer b, which means it is now repelled by the red circles,
and shooting it out the end. in good flights, I got into orbit around this mars-like body, at fastest and highest points. it also only explodes 20% of the time, and it is fairly stable. You can use if you credit me.
Note 1: if you make an actual space program with this, make everything immortal except for the fuel, including celestial bodies.
Controls: arrow keys, down arrow key to "superboost", which makes it nearly impossible to thrust-vector, but makes you go fast.