Explore This SectionScienceDawnBoulders on VestaSolar System ResourcesCurated Resource PackagesSolar System Home Boulders on VestaOctober 12, 2011 This image from NASA's Dawn spacecraft shows a fresh scarp rimmed crater with many boulders on asteroid Vesta's crater floor. These boulders have diameters of 100-200m, which is roughly the size of many asteroids.