NASA's Dawn Spacecraft Closes In On Its Target

The Dawn spacecraft will soon enter orbit around Vesta, an asteroid the size of Arizona, to study it. Principal Investigator Christopher Russell discusses how the craft will investigate the asteroid's elements and surface minerals, and what that might reveal about the birth of the solar system.

Source: http://www.npr.org/2011/05/20/136501168/nasas-dawn-spacecraft-closes-in-on-its-target?ft=1&f=1026

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