For 10 points, name these small, dark regions on the surface of the Sun.
A "butterfly diagram" graphs the Royal Greenwich Observatory's data on the latitude of these phenomena. A lull in their frequency in the 17th century corresponds to the Little Ice Age and is called the (*) Maunder minimum. The number of these objects rises and falls in a roughly 11-year cycle, and they have a temperature roughly a thousand Kelvin cooler than their surroundings. For 10 points, name these small, dark regions on the surface of the Sun.
A "butterfly diagram" graphs the Royal Greenwich Observatory's data on the latitude of these phenomena.
sunspots