Any doctor will tell you that one of the best sources of
information on a sick patient is the patient himself. That's
certainly true for NASA's ailing Mars rover Spirit.
Just before noon on Friday, the rover, which has been in "safe"
mode since Wednesday, sent to the orbiting Mars Odyssey probe a
surprise burst of information, including data on its power
subsystem. That's heady stuff for engineers at the Jet Propulsion
Lab in Pasadena (CA). The rover sent 73 megabits of information in
all.
The transmission was interesting, since JPL sent Spirit a command
to "sleep," which it seems as if Spirit totally ignored. JPL has
said Spirit's flight software just isn't working right, in spite of
commands to reboot the probe's system at least 60 times.