For example, we can estimate the surface temperature of the sun to be roughly 6000 K (10,000 °F) because the actual emission spectrum of the Sun best matches the black body emission spectrum of an obj...For example, we can estimate the surface temperature of the sun to be roughly 6000 K (10,000 °F) because the actual emission spectrum of the Sun best matches the black body emission spectrum of an object at 6000 K, as seen in the following graph.