astronomy : Idioms & Phrases
astronomy satellite
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noun a satellite equipped with a telescope to observe infrared radiation
WordNet
astronomy unit
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noun a linear unit used for astronomical distances
WordNet
Physical astronomy
- that part of astronomy which treats of the causes of the celestial motions; specifically, that which treats of the motions resulting from universal gravitation.
Webster 1913
radio astronomy
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noun the branch of astronomy that detects and studies the radio waves emitted by celestial bodies