What name is given to the cooler areas of the Sun's surface that are visible as dark patches?
Sun spots Sun Spots Sun/Sunspot SUNSPOTS Sunspots Sunspot Solar active region Active region Sun spot Sunspot theory Penumbra (Sun)
sun spot sun sunspot sun spots sunspot sunspots solar active region penumbra sun active region sunspot theory
sunspots
WikipediaEntity
SUNSPOTS