Why not a galaxy collision simulator

Why not a moon formation or planet or star formation where particles randomly flys while others justru collpase or merge into a planetisimal moon or star and yes you got a game of that but it's not really a formation mostly a collision

Oh well im going to think of more be right back

Oh like make the moon Collide with earth or a planet that was i was saying my bad 😅

3 or 5 planet collides at the edge of the planets