NASA's SkyFall helicopters will 'show us parts of Mars we've never seen before', scientists say
NASA invites researchers to propose Mars landing sites for its SkyFall helicopter mission
NASA Mission page on Space Reactor 1 Freedom, and its payload Skyfall.
NASA pushes Mars helicopter rotors past the speed of sound for the first time ever — next-gen “SkyFall” aircraft's rotors hit 3,750 RPM, ten times faster than normal helicopters
NASA's '1st nuclear powered interplanetary spacecraft' will send Skyfall helicopters to Mars in 2028
