Comet Enthusiast

Experts hold out slim hopes that hard-working NASA robot didn't freeze to death during Martian winter, but NASA is making one final effort to detect signs of life in the dormant Phoenix Mars Lander. This week marks NASA's fourth attempt to listen for signals showing that the Mars Lander did not perish during the frigid -- and long -- Martian winter. The Mars Odyssey made similar attempts in January, February and April of this year. NASA scientists received the last transmission from the Lander on Nov. 2, 2008.