Do metal-poor stars tend to have different colors than metal-rich stars?
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- Are there any known stars with unusual or unexplained colors? What are Thorne-Żytkow objects and what colors might they exhibit if they exist?
- What is the future of our Sun's color as it evolves off the main sequence? What might be the colors of stars in other hypothetical types of galaxies?
- Do stars in other galaxies exhibit the same range of colors as those in the Milky Way?
- How do Herbig Ae/Be stars compare in color to T Tauri stars?
- How does the chemical composition of a star's atmosphere influence its spectrum and perceived color? What are magnetic stars and do their strong magnetic fields affect their color?
- Are there green stars? Why are some stars red?
- How does the study of star colors contribute to our understanding of the universe's evolution?
- What is stellar evolution and how does it affect color? What is the Hertzsprung-Russell diagram and how does it relate to star color?
- What are carbon stars and what makes them appear red?
- Are there red galaxies or blue galaxies?
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