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the branch of astronomy that utilizes extraterrestrial radiation in radio wavelengths rather than visible light for the study of the universe.
a branch of astronomy in which a radio telescope is used to detect and analyse radio signals received on earth from radio sources in space
radio astronomy
The study of celestial objects by measurement of the radio waves they emit. Radio astronomy has enabled the detection and study of objects such as pulsars, quasars, radio galaxies, and other objects, some of which emit considerably less radiation at other wavelengths. Radio astronomy has contributed to the discovery of cosmic background radiation and has enhanced the understanding of solar activity and the structure of galaxies. See also radio telescope.


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  • Radioautograph

    [rey-dee-oh-aw-tuh-graf, -grahf] /ˌreɪ di oʊˈɔ təˌgræf, -ˌgrɑf/ noun 1. . /ˌreɪdɪəʊˈɔːtəˌɡrɑːf; -ˌɡræf/ noun 1. another name for autoradiograph radioautograph ra·di·o·au·to·graph (rā’dē-ō-ô’tə-grāf’) n. See autoradiograph.

  • Radioautography

    [rey-dee-oh-aw-tog-ruh-fee] /ˌreɪ di oʊ ɔˈtɒg rə fi/ noun 1. .

  • Radio-beacon

    noun 1. a radio station that sends a characteristic signal so as to enable ships or airplanes to determine their position or bearing by means of a radio compass. noun 1. a fixed radio transmitting station that broadcasts a characteristic signal by means of which a vessel or aircraft can determine its bearing or position […]

  • Radio-beam

    noun 1. (def 12). noun 1. a narrow beam of radio signals transmitted by a radio or radar beacon, radio telescope, or some other directional aerial, used for communications, navigation, etc Sometimes shortened to beam

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