Mars Rover Curiosity will not return to the "Rocknest" site where some people believe a "Mars rat" was spotted. The "rodent" was seen as the rover zoomed-in on a patch of rocks. The so-called "Mars rat" has UFO buffs claiming that there may be life that is indigenous to Mars. Scientists operating Curiosity say the shape is a rock formed by "wind erosion and mechanical abrasion." The rover is currently on its way to Mount Sharp -- a mountain that rises 3.4 miles into the Mars sky.