the use of radar to map the surfaces of the planets, their satellites, and other bodies
radar astronomy in American English
noun
the branch of astronomy that uses radar to map the surfaces of planetary bodies, as the moon and Venus, and to determine periods of rotation
Word origin
[1955–60]This word is first recorded in the period 1955–60. Other words that entered Englishat around the same time include: backgrounder, cassette, geodesic dome, life-support, rite of passage