infrared astronomy

the study of infrared radiation emitted by celestial objects.

1960–65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infrared astronomy
the study of radiations from space in the infrared region of the electromagnetic spectrum

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
infrared astronomy  
The study of celestial objects by means of the analysis of the infrared radiation they emit. Because infrared radiation can pass through clouds of interstellar dust or gas that absorb visible light, infrared astronomy enables the study of celestial objects or features that are undetectable by optical telescopes.
The American Heritage® Science Dictionary
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