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.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.