Visions of Mars through PHONIX landing today.

 

PASADENA, California – A three-legged NASA spacecraft was closing in on Mars Sunday for what scientists hope will be the first-ever touchdown near Mars’ north pole to study whether the permafrost could have supported primitive life.

The time it takes the Phoenix Mars Lander to streak through the atmosphere and set down on the dusty surface has been dubbed “the seven minutes of terror” for good reason. More than half of the world’s attempts to land on Mars have ended in failures.

“I’m a little nervous on the inside. I’m getting butterflies,” Peter Smith, principal investigator from the University of Arizona, Tucson, said on the eve of the landing. “We bet the whole farm on this safe landing and we can’t do our science without this safe landing.”

Phoenix is preprogrammed to plummet through the Red Planet’s atmosphere, and will rely on the intricately choreographed use of its heat shield, parachute and rockets to slow its descent from over 12,000 mph to a 5 mph touchdown.

‘Beautiful butterfly’.

In the ideal scenario, “we evolve out of this cocoon and spread our wings and we turn into this beautiful butterfly on the surface,” said Ed Sedivy, program manager at Lockheed Martin Corp., which built Phoenix.

Mission controllers decided late Saturday to skip an opportunity to adjust Phoenix’s flight path since the lander was well on track for its target landing site.

NASA has not had a successful soft landing in more than three decades since the twin Viking landers in 1976. The last time the space agency tried was in 1999 when the Mars Polar Lander angling for the south pole crashed after prematurely cutting off its engines.

Phoenix was built from a lander that was scrapped after the Polar Lander disaster. Engineers spent years testing Phoenix to resolve all known problems, but there are no guarantees on landing day.

“It’s kind of like going to Vegas. If you have high odds, you play a number of times, eventually one of them is going to bite you,” said Barry Goldstein, project manager of NASA’s Jet Propulsion Laboratory. “That’s what’s concerns us the most.”

Phoenix is preprogrammed to plummet through the Red Planet’s atmosphere, and will rely on the intricately choreographed use of its heat shield, parachute and rockets to slow its descent from over 12,000 mph to a 5 mph touchdown.

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