- coronal hole
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a part of the solar corona that appears dark on optical and x-ray images and is characterized by low temperature and low density.[1970-75]
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Universalium. 2010.
coronal hole
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coronal hole — Astron. a part of the solar corona that appears dark on optical and x ray images and is characterized by low temperature and low density. [1970 75] … Useful english dictionary
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Outline of astronomy — Mauna Kea in Hawaii is one of the world s premier observatory sites. Pictured is the W. M. Keck Observatory, an optical interferometer. The following outline is provided as an overview of and topical guide to astronomy: Astronomy – studies the… … Wikipedia
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