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)
penumbra sun sun sunspot sun spot sunspot solar active region active region sunspot theory sunspots sun spots
sunspots
WikipediaEntity
SUNSPOTS