The sun's corona is a blanket of extremely hot gases made up of hihgly ionized materials, including iron. The actual temperature of the corona is more that 100 times hotter than the surface of the sun, but far less dense and puts out only a small fraction of the light that the surface does, so is difficult to see outside of a total eclipse. It is believed that the sun's magnetic fields serve to heat the corona to this elevated temperature.
The sun's corona is a blanket of extremely hot gases made up of hihgly ionized materials, including iron. The actual temperature of the corona is more that 100 times hotter than the surface of the sun, but far less dense and puts out only a small fraction of the light that the surface does, so is difficult to see outside of a total eclipse. It is believed that the sun's magnetic fields serve to heat the corona to this elevated temperature.
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