Astronomers have discovered something remarkable: for the first time, they have found that the color of galaxies depends on the type of stars they contain. In a new study, researchers have discovered that red galaxies are more likely to have older stellar populations, while blue galaxies are more likely to have younger stars. This discovery could help us better understand the formation and evolution of galaxies, and the universe as a whole.

The study, led by an international team of scientists from 15 institutions, used data from the Sloan Digital Sky Survey (SDSS) to examine over 200,000 galaxies. They found that red galaxies have a higher median age for their stars, while blue galaxies have a lower median age. This suggests that the star formation rate in red galaxies is lower, while the rate in blue galaxies is higher. The findings of this study could help us better understand how galaxies form and evolve over time.

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source: Phys.org