Science: A Tenth Planet?

Something new under the sun

Charles Kowal lacks the academic credentials and worldwide renown enjoyed by many of the other scientists at the California Institute of Technology. Though he is the author of some two dozen scientific papers, he has neither a Ph.D. nor a coterie of doting graduate students. What Kowal, 37, does have is a discerning eye and an insatiable appetite for scanning the sky. During the past decade, he has discovered one comet and five more that had somehow been "lost" as well as the 13th—and what may prove to be the 14th—moon of Jupiter, and 80 supernovas, or...

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