Gallolao
We know the Sun rotates because we can observe stationary sun spots moving across its surface.
The ancient Chinese were among the first to observe and document sunspots as early as the 4th century BCE. They noted these dark spots on the sun's surface, which appear in cycles, indicating the dynamic nature of the sun.
Sun spots.
sun spots are cooler parts of the sun
the sun spots like black little spots on the sun that explode every 11 years
Saturn may or may not have Saturn spots. Only the sun has sun spots.
sun spots
Sun spots are not permanent, therefore it depends.
The ancient Chinese astronomers were among the first to observe sunspots, dating back to at least the 4th century BC. However, the first recorded telescopic observation of sunspots is attributed to Galileo Galilei in 1610.
We call them sunspots, but dark and cool are relative terms. A sunspot is dark only relative to the surrounding solar surface, but still intensely bright compared to your common household light bulb. It's cooler than the surrounding solar material, but still hot enough to vaporize a spaceship and anyone inside it in a fraction of a second.
Sun spots are colder than adjacent parts of the sun.
the Chinese were the first ones look at sun spots 800 ad