PASADENA, Calif. -- The Mars rover Curiosity has temporarily stopped science observations while NASA checks out an electrical problem.
The space agency said Wednesday the voltage change was first discovered on Sunday and engineers think it might be some kind of short.
The six-wheel, nuclear-powered rover halted work as a precaution.
So far, there's no sign that the problem is related to a computer reboot earlier this month that put Curiosity in safe mode.
Curiosity landed in a Martian crater in August 2012 and has spent the last several months driving toward its ultimate destination, Mount Sharp.
MORE: Curiosity Lands on Mars
In this handout image provided by NASA, a self-portrait of the Mars rover Curiosity combines dozens of exposures taken by the rover's Mars Hand Lens Imager during the 177th Martian day, or sol, of Curiosity's work on Feb. 3, 2013, on the planet Mars. Curiosity landed on the planet on Aug. 5, 2012. (NASA/JPL-Caltech/MSSS)