Are there red galaxies or blue galaxies?
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- What can the colors of stars in interacting galaxies tell us about the ongoing processes? What are the colors of stars that have been stripped of their outer layers by binary interactions?
- Are there other spectral types beyond O, B, A, F, G, K, and M? What are Wolf-Rayet stars and what colors do they exhibit?
- How do flares on stars impact their brightness and potentially their color for short periods?
- How is the U-B color index used?
- What color might a red giant star be?
- What are the colors of the Magellanic Clouds? Are there any amateur astronomy projects focused on observing and documenting star colors?
- What are the colors of stars in binary systems that are undergoing mass transfer?
- What are emission nebulae and what causes their colors? What are reflection nebulae and why do they appear blue?
- How do exoplanets affect the observed color of their host stars?
- How does star formation relate to the prevalence of certain star colors in a region? What are globular clusters and what is their general color?
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