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New measurement method looks to shed light on universe's expansion

Researchers have devised a new way to measure the Hubble Constant using doubly-imaged quasars in an effort to better understand why the universe is expanding at a faster rate than it once was, according to findings published in the Monthly Notices of the Royal Astronomical Society. Scientists previously used light from systems that create four images of quasars, which are rare, but "[d]oubly-lensed systems ... are more frequent by about a factor of five," says lead study author Simon Birrer.

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