PASADENA, Calif., Aug. 26 (UPI) -- NASA says its Mars rover Spirit, which has been stuck in loose martian sand since April, is losing power due to a dust storm that's blocking its solar panels.

PASADENA, Calif., Aug. 24 (UPI) -- NASA engineers have added another test rover to a project designed to develop a strategy for freeing Mars rover Spirit, which is stuck in loose martian sand.

PASADENA, Calif., May 19 (UPI) -- The U.S. space agency says it's considering the best maneuvers for freeing the Mars rover Spirit, which has become immobilized in soft martian soil.

PASADENA, Calif., May 12 (UPI) -- The U.S. space agency says its Mars rover Spirit is facing a dangerous situation, slipping in soft soil with its wheels sinking halfway into the ground.

PASADENA, Calif., April 14 (UPI) -- The U.S. space agency says its Mars exploration rover Spirit inexplicably rebooted its computer at least twice last weekend.

PASADENA, Calif., March 19 (UPI) -- The U.S. space agency says it has decided to select a new route for its Mars rover Spirit to drive around a corner of a low plateau called "Home Plate."

PASADENA, Calif., March 19 (UPI) -- The U.S. space agency says its Mars rover Opportunity is within sight of the horizon of the big crater toward which it has been traveling for six months.

PASADENA, Calif., Jan. 3 (UPI) -- The unmanned rovers Spirit and Opportunity are showing serious signs of wear after an astounding five years roaming Mars, U.S. space agency officials say.

PASADENA, Calif., Nov. 11 (UPI) -- The U.S. space agency says its Mars rover Spirit has been struck by a dust storm, reducing the amount of sunlight reaching its solar panels.