Optical Method Clocks Expansion of Universe
ANN ARBOR, Mich., April 28, 2021 — Researchers from the University of Michigan and the University of Hawaii Institute of Astronomy proposed an optical method that uses the light from quasars to determine the rate of the universe’s expansion. The method, the researchers said, is more direct than previous approaches. Quasars have been used in this manner before; however, the new method, called intensity correlation speckles, measures the difference between the red shift in two paths of light from the same quasar. Red