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  1. This is a list of astronauts by year of selection: people selected to train for a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft. Until recently, astronauts were sponsored and trained exclusively by governments, either by the military or by civilian space agencies.

    • Astronauts
    • Management Astronauts
    • Astronaut Candidates
    • Former Members

    As of March 2024[update], the corps has 48 "active" astronauts consisting of 20 women and 28 men The highest number of active astronauts at one time was in 2000 when there were 149.All of the current astronaut corps are from the classes of 1996 (Group 16) or later. There are currently[citation needed] 19 "international active astronauts", "who are ...

    As of January 2021[update], the corps has 16 "management" astronauts, who remain NASA employees but are no longer eligible for flight assignment. The current management astronauts are assigned to NASA operations as follows: Ames Research Center (one astronaut); NASA Headquarters (four); & Johnson Space Center (eight).The management astronauts inclu...

    The term "Astronaut Candidate" (informally "ASCAN") refers to individuals who have been selected by NASA as candidates for the NASA Astronaut Corps and are currently undergoing a candidacy training program at the Johnson Space Center. The most recent classof astronaut candidates was selected in 2021. Only three astronaut candidates have resigned be...

    Selection as an astronaut candidate and subsequent promotion to astronaut does not guarantee the individual will eventually fly in space. Some have voluntarily resigned or been medically disqualified after becoming astronauts but before being selected for flights. Civilian candidates are expected to remain with the corps for at least five years aft...

  2. This is a list of astronauts by year of selection: people selected to train for a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft. Until recently, astronauts were sponsored and trained exclusively by governments, either by the military or by civilian space agencies.

  3. This is a list of astronauts by year of selection, people selected for training for a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft. Until recently, astronauts were sponsored and trained exclusively by governments, either by the military or by civilian space agencies.