Reference Entry


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 auxiliary system in a spacecraft that can quickly replace a primary system that fails. A back-up can also be used for additional power: one main computer and two back-ups are needed to operate the robot arm on the ...

Reference Entry.  43 words. 

Subjects: Astronomy and Astrophysics

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