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If a galaxy shows any significant colour band, then it is due to the type of stars present in that galaxy. A blue or white galaxy would have to have a predominant amount of OB stars to project that colour band.

Spiral galaxies do not have significantly greater amounts of OB stars, so it is only a "visual" appearance, not a factual one.

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15y ago
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15y ago

The main reason that spiral arms appear blue is that the arms are sites of star formation and are brighter than the surrounding disk.

The stars tend to be young, hot OB stars which are blue (blue-white) in colour.

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10y ago

Spiral galaxies are mainly blue or white because of recent star formation. Elliptical galaxies are mainly red because they contain no young stars.

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Q: Why are spiral galaxies mainly blue or white?
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