A corona (Latin, ' crown ') is an aura of plasma that surrounds the Sun and other stars. The Sun 's corona extends millions of kilometres into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph. The word corona is a Latin word meaning "crown '', from the Ancient Greek κορώνη (korōnè, "garland, wreath '').
when can the sun's corona best be seen
during a total solar eclipse