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>> communicate to earth. >> his team made the landing happen. >> mars has an annoying atmosphere equivalent to earth at 120 to 150,000 feet. >> that was too thin to slow down curiosity enough with parachutes. he and his team fought up the sky crane. a craft that would lower the rover to the surface with cables and then speed off and crash land a safe distance away. >> every time we spoke of it, we would lose credibility. it looked so crazy. >> the plan worked. landing humans on the red planet would be a lot harder. >> curiosity was about two metric tons as she approached the surface of mars. w...

>> adamsteldzner is the scientist who made it happen. >> mars' atmosphere is thin. it's equivalent to the atmosphere on earth at 120,000 feet to 150,000 feet. >> too thin to slow down "curiosity" enough with parachutes, so he and his team thought up the sky crane, a rocket-powered craft that would lower the rover to the surface with cables and then speed off and crash-land a safe distance away. >> we knew that every time we spoke of it we would lose our credibility because it looked so crazy. >> the crazy plan worked. but landing humans on the red planet would be a lot harder than landing a ro...

Star rocket scientist at the nasa's jet propulsion whose team made it happen. >> mars has an annoying atmosphere. it's very thin equivalent to the atmosphere on earth, 120 to 150,000 feet. >> that was too thin to slow down curiosity enough with parachutes so a craft that would lower the surface with cable, speed off and crash land a safe distance away. >> we knew every time we spoke of it we'd lose our credibility because it looked so crazy. >> the crazy plan worked. landing humans on the red planet will be a lot harder than landing a rover. >> curiosity was about two tons two metric tons as s...