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.
the use of radar to map the surfaces of the planets, their satellites, and other bodies
The scientific study of nearby astronomical objects by reflecting microwaves off the objects and analyzing the echoes. The techniques of radio astronomy can be tailored to answer specific questions, such as the rotation period of the inner planets and the Moon. They have has also been used to test General Relativity, measure distances and features of planets in the solar system, and determine the composition, position, and spin of asteroids.
noun 1. a radar device at a fixed location that, on receiving a radar signal, automatically transmits a particular radar signal in reply, identifying itself and enabling navigators of ships and aircraft to determine their distance and direction from it. noun 1. a device for transmitting a coded radar signal in response to a signal […]
noun 1. a small, handheld Doppler radar device used to measure the speed of vehicles or other moving objects. radar gun A usually hand-held device that measures the velocity of a moving object by sending out a continuous radio wave and measuring the frequency of reflected waves. See more at Doppler effect.
radarkymography ra·dar·ky·mog·ra·phy (rā’där-kī-mŏg’rə-fē) n. Video tracking of heart motion by means of image intensification and closed circuit television during fluoroscopy, enabling cardiac motion to be measured by reproducible linear graphic tracing.
[rey-dahr-muh n, -man] /ˈreɪ dɑr mən, -ˌmæn/ noun, plural radarmen [rey-dahr-muh n, -men] /ˈreɪ dɑr mən, -ˌmɛn/ (Show IPA) 1. a person who operates or helps to operate equipment.