"Signs of water still on Mars" " - - -indications - - - water that seeps out the side- - -"
LIMA, Peru - People could land on Mars in the next 20 to 30 years provided scientists can find water on the red planet, the head of NASA's surface exploration mission said on Wednesday.
Signs of water still on Mars
Thompson said scientists had found a canyon on Mars "that makes the Grand Canyon look like a small canyon," where water could still be present.
"There are indications that there is actually water that seeps out the side of the canyon, and going down the side it evaporates. We believe it's an ongoing process," he said.