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On April 8, the moon’s shadow will fall across North America in a path of totality that starts in Mexico and ends in eastern Canada, giving solar researchers a unique opportunity to observe the sun's outer atmosphere.
During total solar eclipses, which are visible from a different location on Earth roughly every one to two years, the moon briefly obscures the sun’s disk (i.e. the big, round circle) and reveals its corona, or outer atmosphere that radiates beyond it like a halo.
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