Mars Rover Curiosity Has First Big Malfunction National Geographic

The Mars rover Curiosity experienced its first significant malfunction on Wednesday, when one of its two onboard computers became corrupted and failed to turn off and enter “sleep mode” as planned.
The Curiosity team at NASA’s Jet Propulsion Laboratory sent up commands to switch all operations from the corrupted A computer to the twin B computer early Thursday morning, according to a Thursday NASA statement.
Most spacecraft have a backup computer to step in if the primary computer fails. Richard Cook, project manager for the Curiosity project, said the problem was the most serious experienced by the rover so far in its nearly 7 months on the red planet.