Year of the Solar System, July 2011: Asteroids: Leftovers from Planet Building

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Source:  NASA
 Excerpt: …Asteroids are bits of building material remaining from the formation of our solar system ...Asteroids can have families! Some asteroids have moons, some are pairs orbiting each other and still others appear to be rubble piles loosely held together by gravity. ... the largest asteroid, Ceres, has sufficient gravity to become nearly spherical, making it also a dwarf planet!
 
solarsystem.nasa.gov/yss/display.cfm

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