Astronauten
Oleg Grigoryevich Makarov
Russian Federal Space Agency (ROSCOSMOS)
Oleg Kononenko
Russian Federal Space Agency (ROSCOSMOS)
Oleg Kotov
Russian Federal Space Agency (ROSCOSMOS)
Oleg Novitskiy
Russian Federal Space Agency (ROSCOSMOS)
Oleg Skripochka
Russian Federal Space Agency (ROSCOSMOS)
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Oleg Vladimirovich Platonov
Russian Federal Space Agency (ROSCOSMOS)
Oliver Daemen
Blue Origin
Owen K. Garriott
National Aeronautics and Space Administration
Owolabi Salis
Blue Origin
Pamela Melroy
National Aeronautics and Space Administration
Pantaleone Carlucci
National Research Council
Paolo Nespoli
European Space Agency
Patrick Baudry
National Center of Space Research
Patrick G. Forrester
National Aeronautics and Space Administration
Paul J. Weitz
National Aeronautics and Space Administration
Paul Jeris
Blue Origin
Paul Lockhart
National Aeronautics and Space Administration
Paul Scully-Power
National Aeronautics and Space Administration
Paul W. Richards
National Aeronautics and Space Administration
Pavel Belyayev
Russian Federal Space Agency (ROSCOSMOS)
Pavel Popovich
Russian Federal Space Agency (ROSCOSMOS)
Pavel Vinogradov
Russian Federal Space Agency (ROSCOSMOS)
Pedro Duque
European Space Agency
Peggy Whitson
Axiom Space