Reference Entry

back-up

Edited by Stephen O'Meara and E. Julius Dasch

in A Dictionary of Space Exploration

Third edition


Published online July 2018 | e-ISBN: 9780191842764

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An astronaut or cosmonaut serving as a reserve crew member on a mission. Back-ups replace scheduled crew members who become ill or develop other problems....

Reference Entry.  26 words. 

Subjects: Astronomy and Astrophysics

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