When viewed from Earth, even galaxies of the same type (spiral, irregular or elliptical) have a different color

When viewed from Earth, even galaxies of the same type (spiral, irregular or elliptical) have a different color (different color indices). What does it depend on?

The color of galaxies depends: 1) on the absorption of light in our Galaxy; 2) from the distance of the galaxy (i.e. from the redshift); 3) from the activity of star formation in the galaxy.

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