Test operators examine a model capsule after a of test inside the Vehicle Assembly Building to test a rotor system.

Test operators examine a model capsule after a of test inside the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida to test a rotor system landing design. The design would give a capsule the stability and control of a helicopter, but would not be powered. Instead, the wind passing over the rotors as the capsule descends would make the blades turn, a process called auto-rotation. The intent is to give real spacecraft a soft landing with enough control that they could touch down anywhere in the world, whether it be a runway or parking lot. In other words, wherever a helicopter could land, a spacecraft could land, too. Photo credit: NASA/Kim Shiflett