PASADENA, Calif., Aug. 27 (UPI) -- The U.S. space agency's rover Opportunity will soon be back on Mars' plains after nearly a year in a large Martian crater studying ancient rock layers.

PASADENA, Calif., April 24 (UPI) -- The U.S. space agency says a motor in the robotic arm of its Mars rover Opportunity that began stalling more than two years ago has become more troublesome.

WASHINGTON, Oct. 16 (UPI) -- The U.S. space agency, for the fifth time, is extending the program for its Mars Exploration Rovers.

PASADENA, Calif., Sept. 27 (UPI) -- The National Aeronautics and Space Administration said its Mars rover, Opportunity, reached its first destination inside Victoria Crater this week.

PASADENA, Calif., Sept. 12 (UPI) -- NASA's Mars Exploration Rover Opportunity entered Victoria Crater for the first time, reporting its information via the Mars Odyssey orbiter.

PASADENA, Calif., Aug. 28 (UPI) -- The National Aeronautics and Space Administration says both of its Mars exploration rovers -- Spirit and Opportunity -- have resumed functions.

PASADENA, Calif., Aug. 1 (UPI) -- National Aeronautics and Space Administration scientists said they are becoming increasingly concerned about the status of the Mars exploration rovers.

PASADENA, Calif., July 5 (UPI) -- A dust storm on Mars has cut solar power to NASA's rover Opportunity, delaying the U.S.-operated space vehicle from its scheduled decent into Victoria crater.

WASHINGTON, Sept. 7 (UPI) -- NASA's Mars rover Opportunity is closing in on what the U.S. space agency calls an overlooked and rich science trove -- a huge and geologically lush crater.