Shadowfax
<b>mod cow</b>
Comet research pioneer dies
Thursday, September 2, 2004 Posted: 11:57 AM EDT (1557 GMT)
CAMBRIDGE, Massachusetts (AP) -- Fred L. Whipple, a pioneer in astronomy who proposed the "dirty snowball" theory for the substance of comets, has died. He was 97.
the end of a great man...