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How old is the universe?

Our universe is less than 14 billion years old, but how do astronomers know this? ....

United States , Mount Wilson Observatory , New South Wales , Georges Lema , Gregory Laughlin , Henrietta Swan Leavitt , Rebecca Boyle , Geraint Lewis , Fredc Adams , Lawrencem Krauss , Edwin Hubble , Rajendra Gupta , Emilya Margolis , Samantha Thompson , Luke Barnes , Glennd Starkman , Adamg Riess , European Space Agency , Cardiff University , Harvard University , Vanderbilt University , University Of Ottawa , Sydney Institute For Astronomy , Australia Telescope National Facility , International Astronomical Union , European Space Agency Planck ,