The solar corona is the upper, rarefied solar atmosphere which becomes visible around the darkened sun during a total solar eclipse. Shooting a million miles or more out into the hard, cold vacuum of space, this fiery halo is one of the wonders of the universe.
Whipped into gigantic swirls by the Sun's ferocious magnetic fields, the shell of super-hot gas is as beautiful as it is dangerous. The corona can't normally be seen because of the brightness of the Sun, a broiling sea of hydrogen gas.
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