The layer of the sun's atmosphere that looks like a halo during an eclipse is called the corona .

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* The corona is the outermost layer of the sun's atmosphere. It's incredibly hot (millions of degrees Celsius) and very thin, but it extends millions of kilometers into space.
* During a total solar eclipse, the moon completely blocks the sun's bright photosphere. This allows us to see the fainter corona, which normally is too dim to see against the sun's glare.
* The corona appears as a faint, white halo around the eclipsed sun. This halo is made up of ionized gas that's constantly being pushed outward by the sun's powerful magnetic field.

So, the next time you see a total solar eclipse, remember that the beautiful halo you're seeing is the sun's corona!