Example 6: Consider the following discussion between two students: Student 1: I think I understand why sun's "dark spots" are dark - there is no light emitted from these regions on the sun's surface due to strong magnetic fields. Student 2: I disagree. The sun's "dark spots" are really very bright. They look "dark" only because they are cooler than surrounding sun's surface. The magnetic fields suppress convection and prevent hot plasma from reheating the sun spot region