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22 December, 16:51

What are the dark areas on the surface of the sun

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  1. 22 December, 17:31
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    Close up, you'll see that a sunspot has a central dark area-called the umbra, which appears dark because it's cooler than the rest of the Sun's surface
  2. 22 December, 18:19
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    They are called the Coronal Holes.
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