NASA's Curiosity Rover has unearthed more evidence water existed on Mars.

The Curiosity Rover is on its way to Mount Sharp, and used instruments to inspect rocks during a break inside Gale Crater.

The Curiosity Rover found evidence of water in sandstone during a stop on its way to Mount Sharp, researchers said.

The test location was chosen based on promising images from from NASA's Mars Reconnaissance Orbiter...and it paid off, the US space agency said.

"We examined pebbly sandstone deposited by water flowing over the surface, and veins or fractures in the rock," said Dawn Sumner of the University of California at Davis.
"We know the veins are younger than the sandstone because they cut through it, but they appear to be filled with grains like the sandstone," said Sumner.

The stop, at an outcrop called "Darwin" was the first of many planned for  the Mars Curiosity Rover. The Roer will stopfive times between the between the "Glenelg" area, where Curiosity explored for the first half of 2013, and an entry point to the at the lower base of Mount Sharp, which the Rover will later climb.

Researchers are trying to discover clues in the layers of sediment. They planned the stops to collect information and link information about Mount Sharp and what has already been discovered at Glenelg.

They have found evidence water existed already, as well as rocks that hold conditions favorable for microbial life at Yellowknife Bay.

"We want to understand the history of water in Gale Crater," Sumner said.

"Did the water flow that deposited the pebbly sandstone at Waypoint 1 occur at about the same time as the water flow at Yellowknife Bay? If the same fluid flow produced the veins here and the veins at Yellowknife Bay, you would expect the veins to have the same composition," Sumner said.

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