In the images , one pixel corresponds to 45km on vesta 's surface .
这些照片上的每一个像素都代表着灶神星表面45公里的范围。
Ceres , too , is spherical and probably divided into core and mantle , though the mantle seems to be wetter than that of vesta .
虽然谷神星的地幔好像比灶神星的地幔要潮湿的多,但谷神星也是球形的,并可能被划分为地核和地幔。
Vesta 's size ( it is around 520km in diameter ) and density make it massive enough for its gravity to keep it roughly spherical , like a proper planet .