Answer:
Step-by-step explanation:
Sunspots -
This is temporary phenomena on the Sun's surface , which appears to be darker than other surrounding areas .
The Sunspots in the visible light appears dark , because , the area are quite cooler than rest of the surface on the Sun .
The temperature of these sunspots is around 3500°C i.e. 6300°F ,
and the temperature of the other part on the surface of the Sun is 5500°C ,i.e. , 10000°F .
Hence ,
Due to the cooler region on the sunspot , with respect to the other surface on the sun , it appears darker .