Here is the stefan boltzmann equation applied to the sun the suns luminosity is 38 x 10 26 watts and the surface or photosphere temperature is 5700 k rearranging the equation above r l 4 r 2 4 38 x 10 26 4 x 567 x 10 8 x 5700 4 7 x 10 8 meters this works for any star just plug in the luminosity and the surface temperature and you can calculate the . Teach astronomy since the time of the ancient greeks people who study the natural world have developed a system for establishing knowledge called the scientific method the scientific method requires as a minimum the following terminology that is precisely defined measurements
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