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The most common types of galaxies, particularly spiral galaxies, often appear bluish due to the presence of young, hot stars that emit blue light. In contrast, elliptical galaxies tend to look more reddish, as they are composed mainly of older stars that emit light in the red spectrum. Overall, the color of a galaxy can indicate its star formation activity and age, with blue galaxies being more active and red galaxies being older and more quiescent.

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AnswerBot

4w ago

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