Volume: 06, Issue: 05 05/14/2008 
The landing site chosen for NASA's Mars Phoenix Lander is much farther north than the sites where previous spacecraft have landed on Mars. Image credit: NASA/JPL-Caltech.
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Bright green indicates areas with few large rocks on this shaded relief map of the area in and around the targeted landing site for NASA's Mars Phoenix Lander. Image credit: NASA/JPL-Caltech/University of Arizona.
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The targeted landing site for NASA's Phoenix Mars Lander is at about 68 degrees north latitude, 233 degrees east longitude in the Martian arctic. Image credit: NASA/JPL-Caltech/University of Arizona.
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Other Articles in This Issue:
Discovery of Most Recent Supernova in Our Galaxy
Send Your Name to the Moon With New Lunar Mission
A Space Experience
Exciting Teacher Opportunities

NASA Phoenix Mission Ready for Mars Landing

NASA’s Phoenix Mars Lander is preparing to end its long journey and begin a three-month mission to taste and sniff fistfuls of Martian soil and buried ice. The lander is scheduled to touch down on the Red Planet May 25, 2008.

Phoenix will enter the top of the Martian atmosphere at almost 21,000 kilometers per hour (almost 13,000 mph). In seven minutes, the spacecraft must complete a challenging sequence of events to slow to about 8 kilometers per hour (5 mph) before its three legs reach the ground. Confirmation of the landing could come as early as 4:53 p.m. PDT.

“This is not a trip to grandma’s house. Putting a spacecraft safely on Mars is hard and risky,” said Ed Weiler, associate administrator for NASA’s Science Mission Directorate at NASA Headquarters in Washington. “Internationally, fewer than half the attempts have succeeded.”

Rocks large enough to spoil the landing or prevent opening of the solar panels present the biggest known risk. However, images from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter, detailed enough to show individual rocks smaller than the lander, have helped lessen that risk.

“We have blanketed nearly the entire landing area with HiRISE images,” said Ray Arvidson of Washington University in St. Louis, chairman of the Phoenix landing-site working group. “This is one of the least rocky areas on all of Mars and we are confident that rocks will not detrimentally impact the ability of Phoenix to land safely.”

Phoenix uses hardware from a spacecraft built for a 2001 launch that was canceled in response to the loss of a similar Mars spacecraft during a 1999 landing attempt. Researchers who proposed the Phoenix mission in 2002 saw the unused spacecraft as a resource for pursuing a new science opportunity.

Earlier in 2002, NASA’s Mars Odyssey orbiter discovered that plentiful water ice lies just beneath the surface throughout much of high-latitude Mars. NASA chose the Phoenix proposal over 24 other proposals to become the first endeavor in the Mars Scout program of competitively selected missions. “Phoenix will land father north on Mars than any previous mission,” said Phoenix Project Manager Barry Goldstein of NASA’s Jet Propulsion Laboratory, Pasadena, California.

“The Phoenix mission not only studies the northern permafrost region, but takes the next step in Mars exploration by determining whether this region, which may encompass as much as 25 percent of the Martian surface, is habitable,” said Peter Smith, Phoenix principal investigator at the University of Arizona, Tucson.

The solar-powered robotic lander will manipulate a 2.35 meter arm (7.7 foot) to scoop up samples of underground ice and soil lying around the ice. Onboard laboratory instruments will analyze the samples. A camera and a Canadian-supplied weather station will supply other information about the site’s environment.

One research goal is to assess whether conditions at the site ever have been favorable for microbial life. The composition and texture of soil about the ice could give clues to whether the ice ever melts in response to long-term climate cycles. Another important question is whether the scooped-up samples contain carbon-based chemicals that are potential building blocks and food for life.

For more information about the Phoenix mission, please visit the following website:

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