This image released by NASA shows gullies eroded into the wall of a meteor impact crater in Noachis Terra from the Mars Global Surveyor, MGS, Mars Orbiter Camera, MOC, September 28, 1999. After more than two weeks of silence from the 10-year-old Mars Global Surveyor, scientists began to sound resigned Tuesday, Nov. 21, 2006. NASA's best effort to find a missing Mars space probe failed Monday night, and though scientists at the space agency began to lose hope, they said they will try again. (AP Photo/NASA/JPL/Malin Space Science Systems)
An area on Mars discovered by NASA's Mars Global Surveyor shows what is believed to be the inverted floor of a former meandering stream, in an undated image. NASA is running out of options for fixing the Glolbal Surveyor, officials said on Monday. (NASA/Handout/Reuters)