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Science 6 August 1999:
Vol. 285. no. 5429, p. 827
DOI: 10.1126/science.285.5429.827d
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Astronomer Fred Whipple, at age 92, has joined the team planning NASA's Contour mission, which will rendezvous with several comets early next century. In the 1950s Whipple proved that comets must have solid blobs of rock and ice at their cores. Since his first retirement--in 1973--he's published more than 100 scientific papers. "I hope I live long enough to be around when they get the first results back" in 2003, he says. "But this may be my swan song."

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Science. ISSN 0036-8075 (print), 1095-9203 (online)