remember that big crater, the 300-mile crater at the sÃo paulo vesta which is the source of the mediaright, crashed into it about 1,000,000,000 years ago. it is estimated it is estimated that that body that crashed into it is around 30 or so miles in diameter. that's pretty big. if you imagine that question at your backyard, that probably would not be appreciated by you or your neighbors. that's a big thing. it's large compared to the object which crashed into earth and is primarily responsible for the extinction of the dinosaurs. another species 66 million years ago. that was a big job object and a big impact. that's the estimated size of it. >> so once again, thank you thank you very much for coming to jpl. after hearing about the mission. [applause]. >> the c-span radio act makes it easy to follow the 2016 election election wherever you are. free to download from the apple i app store get up-to-the-minute schedule information for c-span radio and television. plus podcast times for public affairs, books and history programs. stay up-to-date on election coverage. c-span's radio that