The first seconds of the total solar eclipse, with the Moon just starting to clip the limb of the Sun on the lower right side.
Near the centre and upper left of the Sun are prominent sunspots, regions of the Sun's atmosphere that are held in place by powerful magnetic fields. This allows them to cool without sinking back into lower layers to reheat. Being cooler than their surroundings means they give off less light, and so appear as dark spots.
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