If a satellite tries to land on the moon without rockets to counter the force of gravity, it comes in too fast and crashes into the surface destroying itself. A satellite would be orbiting at approximately 1.8 km/s or so at a 50km altitude, and come in for landing from that height which would speed it up an additional .4 km/s. All in all we are probably talking 1.2km/s in the horizontal direction and 400 m/s in the vertical direction upon touchdown. It would I was thinking there may be some type of airbag that could deploy, and allow it to roll on the surface which would slow it down in the vertical direction. Maybe have it land on a downward slope for a bit of a softer landing? Just something interesting I was thinking of. Any ideas?