Issue Date: March 1, 2010
Rethinking Comet Origins
A tiny comet particle recently brought to Earth by NASA’s Stardust mission was likely forged in the furnace of the inner solar system and then carried outward to the system’s icy edge. The finding, reported by a team led by Jennifer E. P. Matzel of Lawrence Livermore National Laboratory, is forcing scientists to rethink the idea that comets formed in the solar system’s outer reaches from primordial material. Rather, the researchers say, dust . . .
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