Which astronaut flew on more space missions, Piers Sellers or Jean-Jacques Favier?
Piers Sellers Piers John Sellers OBE (11 April 1955 – 23 December 2016) was a British-American meteorologist, NASA astronaut and Director of the Earth Science Division at NASA/GSFC. He was a veteran of three space shuttle missions.
Pedro Duque Pedro Duque Duque (born 14 March 1963) is a Spanish astronaut and a veteran of two space missions.