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

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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