Fig. 69: This image shows the sun's corona, a hot, glowing layer of gas around the sun. Under natural circumstances, the corona is only visible during a total solar eclipse. In contrast to the normally visible surface of the sun (photosphere: which is about 5800K hot, the corona shines much weaker but the temperature is up to 2 million Kelvin. — William Optics Zenithstar 105 ED Triplet APO f/7, 2x Nikon teleconverter , Nikon F100, Fujichrome Velvia 100F, 1/30s, Side, Turkey, March 29, 2006
