astro-youdaoicibaDictYouDict
element active in English word formation from mid-18c. and meaning "star or celestial body; outer space," from Greek astro-, stem and comb. form of astron "star," related to aster "star" (see star (n.)). In ancient Greek, aster typically was "a star" and astron mostly in plural, "the stars." In singular it mostly meant "Sirius" (the brightest star).
cosmo-youdaoicibaDictYouDict
before a vowel cosm-, word-forming element from Latinized form of Greek kosmos (see cosmos). In older use, "the world, the universe;" since 1950s, especially of outer space.
outer (adj.)youdaoicibaDictYouDict
late 14c., comparative of out (on analogy of inner), replacing by 18c. forms descended from Old English uttera (comp. of Old English ut "out") which developed into utter and was no longer felt as connected with out. Outer space first attested 1901 in writings of H.G. Wells.
space (adj.)youdaoicibaDictYouDict
c. 1600, from space (n.). Meaning "having to do with outer space" is from 1894.
spacy (adj.)youdaoicibaDictYouDict
also spacey, 1852, "large, roomy, spacious," from space (n.) + -y (2). Meaning "felt as characteristic of outer space" (especially with reference to electronic music) is attested from 1971, probably influenced by spaced-out (1965, American English slang), a reference to the behavior of people using hallucinogenic drugs (see space (v.)).
astrogationyoudaoicibaDictYouDict
"(In science fiction) navigation in outer space", 1930s: blend of astro- and navigation.