The green galaxy is caught in the act of transforming from blue to red as its gas supply runs out. Credit: James Trayford/EAGLE/Durham University
An international team used new computer modelling of the Universe to investigate the colours that galaxies have and what those colours might tell us about how galaxies evolve. Using the state-of-the-art EAGLE simulations, the researchers modelled how both the ages and composition of stars in galaxies translate into the colour of light that they produce. These simulations showed that colours of galaxies can also help diagnose how they evolve.
While red and blue galaxies are relatively common, rare green galaxies are likely to be at an important stage in their evolution, when they are rapidly turning from blue – when new stars and planets are being...
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