Geoffrey W. Marcy (born September 29, 1954) is an American astronomer, who is currently Professor of Astronomy at the University of California, Berkeley, famous for discovering more extrasolar planets than anyone else, 70 out of the first 100 to be discovered, along with R. Paul Butler and Debra Fischer.
He is credited, along with R. Paul Butler, for discovering Gliese 581 g, the first potentially habitable planet outside of our own solar system.
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