Popular Science: Tonight, a NASA Probe Will Orbit Massive Belt Asteroid, For the First Time
By Rebecca Boyle 07.15.2011
“…Although it lives in the asteroid belt between Mars and Jupiter, the monstrous, 330-mile-wide Vesta is really more of a protoplanet than an asteroid. Most space rocks in its neighborhood are a third of its size, and Vesta has a rocky composition like that of Venus, Earth and Mars, with a core, mantle and crust….”
http://www.popsci.com/science/article/2011-07/nasa-probe-set-orbit-massive-asteroid-tonight
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