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Text File  |  1992-09-01  |  232b  |  7 lines
  1. 1906- . US astronomer, whose hypothesis in
  2. 1949 that the nucleus of a comet is like a
  3. dirty snowball was confirmed 1986 by
  4. space-probe studies of Halley's comet. He was
  5. director of the Smithsonian Astrophysical
  6. Observatory 1955-73.
  7.