cosmonautics

[ koz-muh-naw-tiks, -not-iks ]
/ ˌkɒz məˈnɔ tɪks, -ˈnɒt ɪks /

noun (used with a singular verb)

astronautics, especially as applied to space flight.

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Origin of cosmonautics

First recorded in 1945–50; see origin at cosmonaut, -ics
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020