Phoenix makes picture-perfect Mars landing

Taking in the arctic sights
Phoenix’s target landing site was a 30-mile-wide (50-kilometer-wide) shallow valley in the high northern latitudes, similar in location to Earth’s Greenland or northern Alaska. The site was chosen because images from space spied evidence of a reservoir of frozen water close to the surface.

Like a tourist in a foreign country, the lander initially will take in the sights during its first week on the Red Planet. It will talk with ground controllers through two Mars orbiters, which will relay data and images.

Phoenix is equipped with an 8-foot-long (2.4-meter-long) arm capable of digging trenches in the soil to get to ice that is believed to be buried inches to a foot deep. Then it will analyze the dirt and ice samples for traces of organic compounds, the chemical building blocks of life.

The lander also will study whether the ice ever melted at some point in Mars’ history when the planet had an environment warmer than the current harsh, cold one it currently has.

Scientists do not expect to find water in its liquid form at the Phoenix landing site because it’s too frigid. But they say that if raw ingredients of life exist anywhere on the planet, they likely would be preserved in the ice.

Phoenix, however, cannot detect signs of alien life that may exist now or once existed.

The only other time NASA searched for chemical signs of life was during the Viking missions. Neither lander found conclusive evidence of life.

Avoided Polar Lander's doom
Phoenix avoided the doom of its sister spacecraft, the Mars Polar Lander, which in 1999 crashed into the south pole after prematurely cutting off its engines. The Polar Lander loss, along with the earlier loss of an orbiter the same year, forced NASA to overhaul its Mars exploration program.

Phoenix, named after the mythical bird that is reborn from its ashes, inherited hardware from a lander mission that was scrapped after the back-to-back Mars losses, and carries similar instruments that flew on Polar Lander.

Built by Lockheed Martin Corp., Phoenix is the first mission from NASA’s Scout program, a lower-cost complement to the space agency’s pricier Mars missions. It cost $420 million to develop and launch Phoenix, compared with the $820 million originally invested in the twin rovers.

The rovers have dazzled scientists with their Energizer Bunny-like ability to keep going and their geologic findings that ancient Mars once had water that flowed at or near the surface.

Mission managers do not expect Phoenix to be as hardy as the rovers, since winter will set in later this year at the landing site with fewer hours of sunlight available each day to power the lander’s solar panels.

This report includes information from The Associated Press and msnbc.com.

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