Early returns from the Dawn probe orbiting the giant asteroid Vesta are revealing a world some scientists are calling the smallest terrestrial planet. Images so far show a world with a much rougher, more heavily cratered surface than most asteroids, and a world that has seen lava flows. There is also a marked difference between the northern and southern hemispheres.
Perhaps the most dramatic find so far is a mountain on Vesta-- a world only 330 miles in diameter-- that is taller than Mauna Kea, the tallest mountain on Earth as measured from the ocean floor.
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