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- The outermost, sparse layer of a star's (in speech, usually the Sun's)
- atmosphere. The Sun's corona is best visible during solar eclipses.
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- The Sun's corona reaches out millions of kilometres and its shape varies
- according to the sunspot cycle. The temperature of the Sun's corona is millions
- of degrees, although the surface beneath it is only 6,000oC. The heat is caused
- by energy being transferred into the corona from loops caused by the magnetic
- field. The sparse gas is heated by strong electrical currents generated between
- these loops, which can stretch over, under, and around each other.
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- The structure of the Sun.
-