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astronomy British & World English

The branch of science which deals with celestial objects, space, and the physical universe as a whole

radar astronomy British & World English

The branch of astronomy that uses radar to map the surfaces of planetary bodies in the solar system

radio astronomy British & World English

The branch of astronomy concerned with radio emissions from celestial objects

X-ray astronomy British & World English

The branch of astronomy concerned with the detection and measurement of high-energy electromagnetic radiation emitted by celestial objects