Dawn is falling toward Vesta today as NASA's spacecraft is currently circling one of the largest asteroids in the solar system and preparing to take a closer look at an asteroid first viewed by German astronomer Heinrich Wilhelm Olbers on March 29, 1807. The picture above is one of the latest images taken by Dawn of three craters on the surface of Vesta called “Snowman”that are located in Vesta's northern hemisphere. The associated picture below is of craters visible in the southern e...