Slovenian physicist Dušan Petrač, who was a leading NASA scientist, has died at the age of 91.
Petrač was a world-renowned physicist and the first Slovenian candidate for a flight into space. Since 1973 he was directly involved in experiments in the zero-gravity laboratory, and in experiments with rockets, space taxis and artificial satellites.
He joined the NASA Jet Propulsion Laboratory in Pasadena, California, and in 1977 became a senior science advisor at NASA. He worked at the laboratory until his retirement in 2012.
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