(PhysOrg.com) -- NASA's Mars Odyssey orbiter has completed 11 overflights, listening for the Phoenix Mars Lander on Jan. 19 and 20, without hearing anything from the lander.
Nineteen more listening overflights are planned this week, and additional attempts in February and March.
The attempts are being made because of the unlikely scenario that Phoenix has survived Martian arctic winter conditions the spacecraft was never designed to withstand.
Phoenix landed on Mars on May 25, 2008, and operated successfully about two months longer than its planned three-month mission near the Martian north polar region.
Explore further: Interplanetary networking: ESA's Mars Express will keep an eye on NASA's Phoenix