Astronomers discover a great galactic genocide 11 billion years ago | by Ethan Siegel | Starts With A Bang! | Sep, 2021

This composite image of galaxy cluster MACSJ 0138 shows data from the Atacama Large Millimeter/submillimeter Array (ALMA) and NASA’s Hubble Space Telescope. The magnified section shows a bright orange/red dot, which traces cold dust observed in radio using ALMA. This cold dust helps scientists to understand, by inference, the amount of cold hydrogen gas — required for the formation of stars — present in the galaxies in the cluster. (Credit: ALMA (ESO/NAOJ/NRAO)/S. Dagnello (NRAO), STScI, K. Whitaker et al.)

The most massive galaxies lost their star-forming material very early on and never got it back.

Ethan Siegel

Today, our view of the galaxies in the universe shows that they are full of a wide mix of stars. Most galaxies, much like our Milky Way, contain old stars, middle-aged stars, and young stars…

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