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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 shift occurs as light stretches as it travels through an expanding universe, causing its wavelength to elongate.
When a massive galaxy cluster lies between Earth and a given quasar, light from the same quasar can travel directly to us, or it can…READ MORE