Right now they are energy particles, but I'm suggesting one that would behave as normal powder instead. This would be gravitons that don't disappear after a time, and also don't pass through each other. With normal gravity and air turned off, and Newtonian gravity turned on, This would allow them to fall together to form planets (just like how real planets form from trillions small pieces of rock floating around in the early solar system). In fact, if you gave a cluster of gravitons an initial velocity via the console commands, you could potentially make one cluster orbit around another, just like real planets do. That would be very interesting to experiment with. It could show tidal destruction of planets, too because if 2 clusters of gravitons got too close together and were moving fast enough, instead of falling together to make a bigger planet, they would rip each other apart from their gravitational force. That would be really cool.