The Solar System

What is the sun's corona?
Answered by Science Channel
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    Science Channel

  1. The corona is the final (and exterior) layer of the three regions that make up the sun's atmosphere. The corona is the widest of all three regions of the sun's atmosphere, and it extends for several million miles from the photosphere and chromosphere. At an average of 2 million degrees Kelvin, the corona is by far the hottest of the sun's layers. Scientists are still unable to explain why it's so hot. The corona is best seen in X-ray images of the sun and during solar eclipses.

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