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If Big Bang is today the most plausible theory about the origins of things, just how old is the Universe? Robert Kennicutt reckons the answer is 13.7 billion years. In the 1990s he co-led an international team of astronomers which used the Hubble Space Telescope to measure definitively the size and expansion rare of the Universe, using measurements of Cepheid variable stars (a pulsational cosmic yardstick), distant supernovae, and a host of other measurements. Rob's other scientific passion is the formation of stars in the Universe, and how star formation drives the evolution of galaxies themselves. He has been the lead investigator on several Legacy surveys using the Spitzer Space Telescope, the Herschel Space Observatory, and numerous ground-based telescopes around the world.