An astronomer discovers a region on the Sun's surface,roughly the size of Earth,that produces 80% less light than the rest of the Sun's surface.What is the most likely cause of this feature?

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The Answer of An astronomer discovers a region on the Sun's surface,roughly the size of Earth,that produces 80% less light than the rest of the Sun's surface.What is the most likely cause of this feature?

An Astronomer Discovers a Region on the Sun's Surface,roughly the Size