How do the colors of stars in elliptical galaxies differ from those in spiral galaxies?
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- Is there any correlation between the color of a star and the properties of its planetary system? How do the colors of stars in binary systems with white dwarf companions differ from single stars?
- How do massive stars compare in color and lifespan to low-mass stars? What happens to the color of a star as it approaches the end of its life?
- What causes the color changes in Cepheid variables?
- Can the color of a star be used to identify it as a member of a particular stellar population? Are there differences in the average colors of stars in different parts of our galaxy?
- How do the colors of stars in starburst galaxies compare to those in more quiescent galaxies? What is metallicity and how does it affect a star's color?
- Could there be stars formed in the very early universe with colors unlike anything we see today?
- How do debris disks around stars affect the observed light and color of the central star?
- What are S-type stars and what colors are associated with them? What are white dwarf stars and what colors do they have?
- What are the colors of stars that have formed from gas enriched by previous generations of stars? How do the colors of stars in galaxies with different merger histories vary?
- Have star colors played a role in navigation or timekeeping?
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