Final answer:
The solar corona is the outermost part of the Sun's atmosphere, best visible during a total solar eclipse, and extends millions of kilometers above the photosphere.
Step-by-step explanation:
When discussing the solar corona, one can infer that it is located at the outermost edge of the sun. The corona is an extensive outer atmosphere revealed during a total solar eclipse, as the brilliant glare from the Sun's visible disk is blocked by the Moon. It extends millions of kilometers above the photosphere and has a faint luminosity compared to the full moon, which is often obscured by the overpowering brilliance of the photosphere.