Return to Unit List Grade 3 Lesson Review   Type your name:   The Sun is bright and hot because its gasessunspotscoronaSelect your answer give off energy. It is millions of times hotter on the Sun than any place on Earth. It is hotter in the Sun's centergasessunspotscoronaSelect your answer than at the surface. Some cooler parts appear as sunspotsgasescoronasurfaceSelect your answer, or dark areas on the Sun's surfacecoronacentersunspotsSelect your answer. The outermost layer of thin gases around the Sun is the centersurfacesunspotscoronaSelect your answer.