Creating a planetary system from a nebula or via multiple collisions

[kgor93]

Has anyone managed to do this? Ideally, it would be cool to create a nebula with particles that are a mix of Hydrogen, water, iron, silicate, etc and watch them form into planets. Or have a bunch of planets and materials collide with each other and form multiple planets & bodies.

[Minhoca]

When you throw a planet at another planet, the mass of the biggest planet increases. They could make a way so fragments are pulled by their own orbits and make them shock each other, and this way they would get a lot of mass sometime(this if this is not in the game already).