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branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life astrobiology , exobiology , space biology
(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit comet
highly penetrating ionizing radiation of extraterrestrial origin; consisting chiefly of protons and alpha particles; collision with atmospheric particles results in rays and particles of many kinds cosmic ray
(apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins flying saucer , UFO , unidentified flying object
(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere meteor , meteoroid
astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources radio reflector , radio telescope
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