Ultraviolet-astronomy meaning

The branch of astronomy that uses observations of emissions in the ultraviolet part of electromagnetic spectrum to study extraterrestrial sources such as stars, planets, galaxies, and interstellar gas clouds.
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The study of celestial objects by measurement of the ultraviolet radiation they emit. Celestial objects with strong emissions in the ultraviolet range are usually significantly hotter than those whose emissions are stronger in the visible range. Because the ozone layer absorbs most ultraviolet radiation before it reaches the Earth's surface, most ultraviolet observations are made from rocket-borne or space-based instruments.
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