South Pole of Vesta. NASA's Dawn spacecraft shows the south pole of the giant asteroid Vesta. Scientists are discussing whether the circular structure originated by a collision, or by internal processes early in the asteroid's history. Images in higher resolution from Dawn's lowered orbit might help answer that question. The image was recorded by NASA's Dawn spacecraft from a distance of about 1,700 miles (2,700 kilometers). The image resolution is about 260 meters per pixel.