Algodoo

stuff in orbit , moon, planet , spaceship (arrow keys)

each hex block has equal gravity attraction

center of planet dark grey is fixed to background to avoid drifting and to have a reference point

walls are not killer

copy paste pink hexes to make more space junk

to get some blocks in orbit, place them together, place them a bit away from the center planet, then select them and go to velocities and set into orbit