This image shows two areas on Mars in a location named Rocknest that were scooped out by the Curiosity Rover last year. Researchers took samples of the areas to determine whether they were wetter underneath or whether they dried out after scooping. Researchers found that soil moisture was consistent at the surface and underneath. Nevertheless, there is a small amount of water in the soil that astronauts might be able to use to sustain themselves. These finding and others are outlined in a series of papers appearing today in the Journal "Science."