The U.S. space agency NASA says it will make an announcement Tuesday about significant findings from its Mars rover mission.
NASA spokesman Don Savage would not give details ahead of the announcement. But he said the findings relate to the rover Opportunity and its search for the history of water on the planet.
Opportunity and its twin rover Spirit are working on opposite sides of the Red Planet, examining the Martian surface for signs of water - the building block to supporting life.
Since January, the two rovers have sent back scores of data and photographs to NASA scientists trying to construct the geological history of the Mars.
Specifically, they are using rock grinding tools, cameras and other x-ray techniques to examine rocks and soil for minerals related to the existence of water.
The robotic explorers will continue their work until April.