US astronomer who took part in the discovery of the interstellar magnetic field and the discovery and interpretation of quasars. His early work involved the spectroscopic investigation of stellar atmospheres; later work included a study of the structure and composition of white dwarf stars.
Greenstein was born in New York and studied at Harvard. In 1948, he
joined the California Institute of Technology and also the staff of
the Mount Wilson and Palomar Observatories. He became professor of astrophysics
1971. During the 1970s he guided both the US space agency NASA and the
National Academy of Sciences in their policies.
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