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A)... A. B)... B. To determine the star's temperature from its color, astronomers measure the brightness of the star at a series of wavelengths and then determine at which wavelength it emits the most light; that is, at which wavelength is it brightest.We will call that wavelength.. B)... B. To determine the star's temperature from its color, astronomers measure the brightness of the star at a series of wavelengths and then determine at which wavelength it emits the most light; that is, at which wavelength is it brightest.
Masses range from a twentieth to over 50 solar masses and surface temperature can range from 3,000 degrees Celcius to over 50,000 degrees Celcius. The colour of a star is determined by its temperature, the hottest stars are blue and the coolest stars are red.The Sun has a surface temperature of 5,500 degrees Celcius, its colour appears yellow. The energy produced by the star is by nuclear fusion in the stars core.The brightness is measured in magnitude, the brighter the star the lower the magnitude goes down.he Sun has a surface temperature of 5,500 degrees Celcius, its colour appears yellow. The energy produced by the star is by nuclear fusion in the stars core. The brightness is measured in magnitude, the brighter the star the lower the magnitude goes down.