Add Yahoo as a preferred source to see more of our stories on Google. Alan Hale, second right, with fellow comet-hunters, l-r, David Levy, Dr Don Yeomans and Thomas Bopp - MIKE NELSON/AFP via Getty ...
Alan Hale, co-discoverer of the Hale–Bopp comet, has died at 68. His work in astronomy and education left a lasting impact on science.
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