Yakov Borisovich Zel'dovich ForMemRS (Belarusian:Якаў Барысавіч Зяльдовіч, Russian:Я́ков Бори́сович Зельдо́вич; 8 March 1914 – 2 December 1987) was a prolific Soviet physicist born in Belarus. He played an important role in the development of Soviet nuclear and thermonuclear weapons, and made important contributions to the fields of adsorption and catalysis, shock waves, nuclear physics, particle physics, astrophysics, physical cosmology, and general relativity.