The Mars Curiosity Rover has found further evidence that Mars once had significant water movements on the surface of the planet. NASA has released images comparing the smoothed pebbles in rocky outcrops imaged by the rover with those from former river beds on Earth to show that an alluvial fan formed by fast moving water (a river) flowing into the Gale crater where Curiosity is exploring once existed.
Smoothed pebbles in outcrops of rocks imaged by Curiosity are similar to those found on Earth. Courtesy: NASA/JPL-Caltech/MSSS
