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Why is the corona of the sun rarely visible?

Answer 1

The corona is only a millionth of the brightness of the photosphere of the Sun.

The photosphere of the Sun must be obscured, as in the case of a solar eclipse, in order to view the corona, despite the fact that it is millions of times brighter than the photosphere.

The corona can be seen through devices known as coronagraphs, which mimic an eclipse. These are more effective in space and on telescopes atop high mountain peaks than they are in the atmosphere, where solar light scatters and hides the corona.

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Answer 2

Madeline Arroyo

Due to its much lower light than the photosphere, or visible surface of the sun, which emits light and heat that overwhelms the corona's faint light, the corona is only rarely visible outside of total solar eclipses, when the moon obscures the photosphere and makes the corona visible.

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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.