At Purdue University in Indiana, scientists are working on a reactor-like device that uses water circulated by gravity to keep the core cool.
CNN: Today/Tomorrow - Helping nuclear plants keep their cool
It galloped toward the planet's core, accelerating at gravity's constant 32 feet per second per second.
NPR: Defying Gravity, and Odds, in New Orleans
Unlike any other asteroid known today, Vesta has an iron core surrounded by layers of mantle rock and crust, similar to Earth and Mars, preliminary gravity and density measurements suggest.
WSJ: Asteroid Vesta Gets a Close Study
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