"NASA\'s Dawn mission is getting ready to launch on an unprecedented tour of two residents of the asteroid belt. This mission will be the first to orbit two different bodies in our solar system. " "Dawn's goal is to characterize the conditions and processes of the solar system's earliest epoch by investigating in detail two of the largest protoplanets remaining intact since their formations. Ceres and Vesta reside in the extensive zone between Mars and Jupiter together with many other smaller bodies, called the asteroid belt." (NASA)
You can also download this video here: Dawn, Mission to the Asteroid Belt
Click here to go to the NASA Dawn Mission home page, and here for a mission overview. Updates on the Mission status are here. It is scheduled to launch in September.