This is an alphabetical list of astronauts who have been chosen to train for a human spaceflight program to command, pilot, or serve on a spacecraft crew.
More than 600 persons have received astronaut training. Until recently, governments, either the military or civilian space organizations, were the only ones who sponsored and educated astronauts. However, with the introduction of suborbital flight, which began in 2004 with the privately funded SpaceShipOne, a new type of astronaut emerged: the commercial astronaut.
While the term astronaut is occasionally used to refer to anyone who trains for space flight, such as scientists, politicians, journalists, and tourists, this article only includes professional astronauts who have been chosen to train professionally. National space programs, as well as corporate and commercial space projects that train and/or hire their own professional astronauts, fall under this category.
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