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…showed last 75 words of 429 total…white, pale green or orange-red. The colour of the star tells the temperature of the star. A yellow star like the sun is reactively hot, a red star is fairly cool and a blue star is extremely hot. Colour tells more about a star then its temperature. Astronomers use the colour of a star to determine the surface temperature of the star and scientists use the basic star colour and temperature to classify the stars.