Fred Lawrence Whipple was an American astronomer. He is best known for writing an influential paper (published in "Astrophysical Journal " from 1950 to 1955) in which he proposed the "icy conglomerate" hypothesis of comet composition (later called the "dirty snowball" hypothesis). The basic features of this hypothesis were later confirmed, however the exact amount (and thus the importance) of ices in a comet is an active field of research, … Wikipedia
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Cambridge, MA -Dr. Fred Lawrence Whipple, the oldest living American astronomer and one of the last giants of 20th century astronomy, passed away yesterday at the age of 97 following a prolonged illness. cfa-www.harvard.edu/press/pr0428.html
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