Alexei Leonov

David Scott is one of the twelve men to have walked on the Moon. He flew three space missions: first as pilot of Gemini 8 in 1966, then as command module pilot on Apollo 9 in 1969, and finally as commander of Apollo 15 in 1971.

Alexei Leonov was among the first group of cosmonauts selected in 1960 and flew two space missions: first as pilot of Voskhod 2 in 1965 and then in 1975 as commander of Soyuz 19 during the Apollo-Soyuz Test Project.

Christine Toomey, cowriter, is an award-winning journalist with the Sunday Times (London).