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What is a star's corona?

Answer 1

The outermost layer of it's atmosphere.

The corona is the outermost layer of a star's atmosphere, made of very hot plasma (an ionised gaseous state). This plasma is actually hotter than the surface of the sun, and as it cools, matter is thrown into space as solar wind.

Our own star, The Sun, has a corona, but we can't usually see it because the light from The Sun overwhelms it. It is only when The Sun is in The Moon's shadow (a solar eclipse) and the usual light is blocked out, that we can see the corona as a white ring.

I hoped this helped; let me know if I can do anything else:)

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Answer 2

Jordan Andrews

The outermost layer of a star's atmosphere, known as the corona, is visible as a faint, glowing halo around the sun during a total solar eclipse. The corona is made of extremely hot ionized gas, or plasma, and can reach temperatures of millions of degrees Celsius. It extends beyond the chromosphere.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.