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Bohdan Paczyński or Bohdan Paczynski (8 February 1940 - 19 April 2007) was a Polish astronomer, a scientist in theory of the evolution of stars, accretion discs and gamma ray bursts.

Paczyński was born February 8, 1940, in Vilnius, Lithuania to a family of a lawyer and a teacher of Polish literature. In 1945 his family chose to leave for Poland and settled in Kraków, and then in 1949 in Warsaw. At the age of 18, Paczyński published his first scientific article in Acta Astronomica. Between 1959 and 1962 he studied astronomy at the University of Warsaw. Two years later he received a doctorate under the tutelage of Stefan Piotrowski and Włodzimierz Zonn.