Summary

Astronomers may be getting closer to solving a long-standing mystery about the universe's largest galaxies. Observations from the X-Ray Imaging and Spectroscopy Mission, known as XRISM, are providing new evidence that supermassive black holes could be preventing these giant galaxies from forming as many stars as expected. According to current models, the most massive galaxies should contain more stellar mass than astronomers actually observe. The shortfall suggests that some process has been suppressing star formation.

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