[ehsanu1]

It's a cool idea, but seems super sci-fi. Might need some wonder materials to make it feasible, even then that would be a really big crumple zone. Or flubber. Another crazy idea: latch on to the planet from the side, like a skateboarder hitching a ride by hanging on to a truck. Again, wonder materials required.

[azernik]

NASA and the Soviets didn't need any wonder materials, just airbags. (Though they did a lot of braking first - either with the atmosphere for NASA at Mars, or with thrusters for the Soviets at the Moon.)