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The chromosphere is a layer of the Sun’s atmosphere. Astronomers cannot see it in ordinary visible light, so they use instruments that detect other wavelengths of light, then transform the data into pictures that they can see. Astronomers using the European Solar and Heliospheric Observatory (SOHO) used such a process to obtain these images.
Courtesy of SOHO/EIT consortium. SOHO is a project of international cooperation between ESA and NASA. http://sohowww.nascom.nasa.gov
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