Dr Steve Curran, from the School of Chemical and Physical Sciences, answers: That's an easy one—13.7 billion years ago. The universe is expanding, so all the galaxies are moving apart from each other, and if you extrapolate this backwards they all meet at a point 13.7 billion years ago.
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13.7 billion years ago
Dr Steve Curran, from the School of Chemical and Physical Sciences, answers: That's an easy one—13.7 billion years ago. The universe is expanding, so all the galaxies are moving apart from each other, and if you extrapolate this backwards they all meet at a point 13.7 billion years ago.