born July 13, 1924 died January 11, 2007
Obituaries published in: The Times March 14, 2007 p 73
He was best known for his studies of the birth of stars and innovative methods of observing gaseous nebulae. He also investigated galactic nuclei, the black holes at the centre of galaxies. He was president of the American Astronomical Society. As well as textbooks and articles he also published historical studies of 19th and 20th century astronomy.
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