This images of the sun captured by NASA's Solar Dynamics Observatory from May 17-19, 2016, shows a giant dark region on the star's upper half, recognized as a coronal hole. Coronal holes are low-density region of the sun’s atmosphere, recognized as the corona. Because they contain little solar material, they have inferior temperatures and thus appear a great deal darker than their surroundings. Coronal holes are visible in sure types of extreme ultraviolet light, which is classically invisible to our eyes, but is colorized here in mauve for easy viewing.
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