Who is an astrophysicist for the European Space Agency, Dirk Frimout or Georgi Ivanov?
Dirk Frimout Dirk Dries David Damiaan, Viscount Frimout (born 21 March 1941 in Poperinge, Belgium) is an astrophysicist for the European Space Agency. He flew aboard NASA Space Shuttle mision STS-45 as a payload specialist , making him the first Belgian in space .
Bruno Bertotti Bruno Bertotti (born 1930) is an Italian physicist, emeritus professor at the University of Pavia. He was one of the last students of Erwin Schrödinger. Bruno Bertotti is well known for his contributions to general relativity — particularly the Bertotti-Robinson electrovacuum, an exact solution of the Einstein field equation. He has also obtained a more accurate measurement of the parameter gamma of the parameterized post-Newtonian formalism, with the Cassini radioscience experiment. The PPN gamma parameter measures the curvature of space in metric theories of gravity and it is equal to one in general relativity.