A series of stunning new images from the NASA rover Curiosity have revealed what scientists say if the first evidence or cracked, dry mud on the red planet's surface. The images are fresh evidence that the ancient era when these sediments were deposited included some drying after wetter condition. Curiosity has already found evidence of ancient lakes in older, lower-lying rock layers and also in younger mudstone near the mud, in an area called Old Soaker.(Photo/NASA)
