what terrestrial planet is fastest
[ video ]. In fact, the asteroid is so complex that Russell and members of his team are calling it the smallest terrestrial planet.. Vesta has an iron core, notes Russell, and its surface features indicate that the asteroid is differentiated like the terrestrial planets Earth, Mercury, Mars, and Venus.Differentiation is what happens when the interior of an active planet gets hot enough to melt, separating its materials into layers.esta has an iron core, notes Russell, and its surface features indicate that the asteroid is differentiated like the terrestrial planets Earth, Mercury, Mars, and Venus.