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Some galaxies run out of gas and stop forming stars. Scientists are trying to figure out why

Why did some galaxies run out of the gas needed to make new stars, very early on in their existence? And what might that mean for other galaxies, including our own?

New research from the University of Arizona has been looking into this.

Astronomer Christina Williams, an  assistant research professor at the university, is working on that effort.

The Show spoke with her to learn about her findings.

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Mark Brodie is a co-host of The Show, KJZZ’s locally produced news magazine. Since starting at KJZZ in 2002, Brodie has been a host, reporter and producer, including several years covering the Arizona Legislature, based at the Capitol.