Most previous Mars landers used airbag cushions to prevent damage during touch-down. The Curiosity rover was too heavy for airbags, so a team at the Jet Propulsion Laboratory created the sky crane. On August 5, the crane successfully lowered Curiosity 65 feet, using three nylon tethers, from a thruster-powered platform to the Martian surface. NASA may well turn to the system, which is scalable for different crafts, on future missions to Mars.
Why does the link to the page after this point to an "Access Denied" page? Is the 11th project that classified?
And your spam detector is being stupid.