For a few minutes, the face of the moon will perfectly overlap that of the sun from our perspective on Earth, blocking out most of the light from our star and leaving only the wispy white glow of the sun's outer atmosphere, called the corona. This phase, called, totality, will be dramatic.
The most exciting parts of a total solar eclipse are the sudden twilight effect that occurs in the middle of the day, the appearance of the corona and sometimes large, bright features erupting from the sun's surface called prominences, says Hagai Perets, an astrophysicist at the TechnionIsrael Institute of Technology.
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