http://www.newsweek.com/huge-sunspot-vibrations-face-earth-solar-1740079

Scientists have detected a sunspot that's so huge it's changing the way our sun vibrates.

Sunspots appear as dark blotches on the sun's surface because they are cooler than the surrounding areas. They form where magnetic fields are particularly strong, driven by the electrically charged gases that constantly swirl inside our nearest star.