PASADENA, Calif. โ€” NASAโ€™s Mars Science Laboratory nailed a risky, high-stakes descent and landing into an ancient martian crater Aug. 6, setting the stage for an ambitious, two-year mission to look for habitats that may have been suitable for life.

โ€œThere are many out in the community who say that NASA has lost its way, that we donโ€™t know how to explore, that weโ€™ve lost our moxie. I think itโ€™s fair to say that NASA knows how to explore, weโ€™ve been exploring and weโ€™re on Mars,โ€ NASAโ€™s associate administrator for science John Grunsfeld told reporters shortly after the 1:32 a.m. EDT touchdown.

NASA Administrator Charles Bolden said a successful landing was โ€œcritically important for the nation.โ€

โ€œIt  allows us to stay on pace for what the president asked us to, getting humans to Mars in the mid-2030s,โ€ Bolden said.

The Mars Science Lab rover, nicknamed Curiosity, was the first spacecraft to make a guided descent on another planet and the first to wrap up its 566-million-kilometer voyage by being lowered to the ground on cables spooled out from a jet-powered aerial platform, known as a โ€œsky crane.โ€

โ€œI was a basket case in there, I was really on pins and needles,โ€ said Bolden, who joined the Jet Propulsion Laboratory flight team in the mission control center for landing.

Seven minutes after touchdown, Curiosity, communicating through NASAโ€™s Mars Odyssey spacecraft, relayed its first pictures from the red planet.

One of the  small, low-resolution images, taken with covers still on the camera lenses, showed the roverโ€™s shadow cast on the rocky surface of Mars.

The $2.5-billion mission, billed as NASAโ€™s first astrobiology investigation since the 1970s-ear Viking missions, will unfold slowly, with weeks of instrument checkouts and practice runs on tap before Curiosity sets off to explore a five-kilometer high mound of layered rock rising from the crater floor.

โ€œWeโ€™re going to make sure that weโ€™re firing on all cylinders before we blaze out across the plains,โ€ said lead scientist John Grotzinger.

Stop-motion video (Credit: NASA/JPL-Caltech)

From the Mars Descent Imager aboard MSL as it descended to the surface of Mars.

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