Stars have different colors depending on what stage of their lifecycle they are, and what temperature they're burning. Stars that are relatively cool, and burn at around 3500 Kelvin will be red. Stars that are really hot, over 10,000 Kelvin, will be blue. Our sun burns at approximately 6,000 degrees kelvin, which means there is only one color it can be; white!
Read more at http://www.omg-facts.com/Science/The-Sun-Is-Actually-White/48488#qU5qtAxwLHJAuTEc.99
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