Sun Spots
On the surface of the sun, there are more than 1,000 super-granules that make up photosphere. Mixed among them, there are dark patches called the sun spots. Sun spots are caused by the sun’s magnetic field. This is why they appear darker than the rest. In other words, they are cooler than the granules around them.
A single granule can be as big as the size of 5 earths! The cycle of a sun spot is within 11 years. Firstly, a part of sun’s surface is empty of it. Then, the sun spot appears and begin to move diagonally (in a single cycle, there are 200 of it). Lastly, the sunspots disappear and the sun is blank again.
By studying these sun spots, we can learn that the movement of sunspots seems to indicate that the sun is actually spinning like the other planets.
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