Dictionary
as•tro•nau•tics
Pronunciation: (as"tru-nô'tiks, -not'iks), [key]—
n. (used with a sing. v.)
the science of or technology involved in travel beyond the earth's atmosphere, including interplanetary and interstellar flight.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.