Who is an astrophysicist for the European Space Agency, Dirk Frimout or Georgi Ivanov?
Georgi Ivanov Major general Georgi Ivanov Kakalov (Bulgarian: Георги Иванов Какалов ; born July 2, 1940) is a retired Bulgarian military officer and the first Bulgarian cosmonaut. He was a member of the National Assembly of Bulgaria in 1990.
Georgi Nadjakov Georgi Nadjakov (also spelled Georgi Nadzhakov) (Bulgarian: Георги Наджаков ) (26 December 1896 – 24 February 1981) was a Bulgarian physicist. He became a corresponding member of the Göttingen Academy of Sciences (1940) in Germany, member of the Bulgarian Academy of Sciences (1945) and member of the Russian Academy of Sciences (1958).