A new measure of Hubble constant adds to mystery about universe’s expansion rate Red giants — In a forthcoming paper, UChicago scientists announce a new measurement of universe expansion that uses red giant stars.

Prof. Wendy Freedman leads study of red giant stars for new measurement of disputed constant University of Chicago scientists have made a new measurement of how fast the universe is expanding—using an entirely different kind of star than previous endeavors. That value falls in the center of a hotly debated question in astrophysics that may call for an entirely new model of the universe.

Scientists have known for almost a century that the universe is expanding, but the exact number for how fast it’s going has remained stubbornly elusive. In 2001, Prof. Wendy Freedman led a team that used distant stars to make a landmark measurement of this number, called the Hubble constant—but it disagrees with another major measurement, and the tension between the two numbers has persisted even as each side makes more and more accurate readings.

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