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Originally posted by wes_dublin
I dont agree with Phage and the rest of you who say that everybody else is imagining a triangle. I think what you should really be saying is that the layer on top is covering up part of the triangle as the sun moves.
Take this image for example. Are you saying that the sun is not circular in shape? Is the sun only the shape of what can be seen? Think of the cloud as the top layer of the sun.
Yeah... It's called a sunspot.
Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions. They are caused by intense magnetic activity, which inhibits convection by an effect comparable to the eddy current brake, forming areas of reduced surface temperature.
Coronal holes are areas where the Sun's corona is darker, colder, and has lower-density plasma than average.