... Light From The Dark Sun . ... Only in the fleeting darkness of a total solar eclipse is the light of the solar corona easily visible from Earth. Normally overwhelmed by the bright solar disk, the expansive corona, the sun's outer atmosphere, is an alluring sight. ... During a total solar eclipse, Earth's moon blocks the sun - almost exactly. ... Mars Weather Watch . ... There, millions of sightseers will witness the Moon move directly between the Earth and Sun, covering up the Sun completely. ...