radio astronomy

noun
the branch of astronomy that utilizes extraterrestrial radiation in radio wavelengths rather than visible light for the study of the universe.

Origin:
1945–50

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Collins
World English Dictionary
radio astronomy
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
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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Example sentences
But the physics of radio astronomy means they are, nevertheless, relatively crude.
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