Correct Answer : (3) The outermost layer of the Sun is called Corona.
The Corona i.e. outermost layer of the Sun is a low density cloud of plasma with higher transparency than the inner layers.
The white corona is a million times less bright than the inner layers of the sun, but is many times larger.
A corona is a type of plasma “atmosphere” of the Sun or other celestial body, extending millions of kilometers into space, most easily seen during a total solar eclipse, but also observable in a coronagraph.
Corona starts at about 2100 km above the photosphere. Corona isn’t visible from the earth (except during solar eclipse).
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