The Chromosphere of our Sun
![The Chromosphere of our Sun](https://public.nrao.edu/wp-content/uploads/2017/04/sun_850_micron-2nd_large.jpg)
The brightest features have a brightness temperature of about 6500 K, and the darkest features have a brightness temperature of about 5500 K.
Credit: (NRAO/AUI/NSF)
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