Definition of galactic noise in English:

galactic noise

Syllabification: ga·lac·tic noise

noun

  • Unidentified radio-frequency radiation coming from beyond the solar system.
    More example sentences
    • And the Voyager signals are directed towards Earth using microwave frequencies where galactic noise is relatively low, and antenna gain is high.
    • Fortunately, however, the man-made and galactic noise abate even more quickly.
    • So-called galactic noise is radio noise from outside the solar system.

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Pronunciation: ˌastrəˈgāSHən
noun
(in science fiction) navigation in outer space