What causes stars to be in so many different colors (blue, red, yellow)?

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View Answer
Their temperature.
Red stars are the coolest stars, blue stars are hottest, and the sun is yellow which is a massive star. Stars are classified on the scale of O, B, A, F, G, K, and M. Those near to O are the hottest ones, and those near to M are the coolest ones. Sun is a G star that comes on the bottom of the scale and has a moderate temperature.

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