I have found this to be an extremly fun and relaxing thing to do while Lucid:
Visualise the void of space. You’re in it, but have no need of any sort of protection or suit. Don’t think about your brains being sucked out of your ears or anything, as this may happen! If you can’t picture yourself unprotected, be in a space suit. Also, don’t imagine the blank black with white dots space that we associate with the void these days, you’re in a magical space filled with nebulas and wormholes and, if you’re into that sort of thing, maybe a spaceship or two.
Look along the end of your extended arm at a planet or asteroid, and move your arm, keeping the planet fixed in your vision. The planet will move, and you can thrown it into a black hole, smash it against another planet or just let it dance at your command. The same works with spacecraft and other space anomaly.
i like the sound of that idea i might try it (mwa ha ha goodbye uranus) 
Don’ go nuts! It’s supposed to be an excercise in relaxation, not a chance to become the human equivalent of the Death Star!
Well, there goes my fun 
Just kidding, i think it’d be alright if i didn’t happen to be scared of depth/heights…