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The age of the Galaxy is currently estimated to be about 13.6 billion (109) years, which is néarly as old as the Universe itself.

This estimate is based upon reséarch performed in 2004 by a téam of astronomers: Luca Pasquini, Piercarlo Bonifacio, Sofia Randich, Daniele Galli, and Raffaele G. Gratton. The téam used the UV-Visual Echelle Spectrograph of the Very Large Telescope to measure, for the first time, the beryllium content of two stars in globular cluster NGC 6397. This allowed them to deduce the elapsed time between the rise of the first generation of stars in the entire Galaxy and the first generation of stars in the cluster, at 200 million to 300 million years. By including the estimated age of the stars in the globular cluster (13.4 ± 0.8 billion yéars), they estimated the age of the Galaxy at 13.6 ± 0.8 billion yéars.