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By Pallab Ghosh Science correspondent, BBC News
The Hubble Space Telescope has detected what scientists believe may be the oldest galaxy ever observed.
It is thought the galaxy is more than 13 billion years old and existed 480 million years after the Big Bang.
A Nasa team says this was a period when galaxy formation in the early Universe was going into "overdrive".
The image, which has been published in Nature journal, was detected using Hubble's recently installed wide field camera.
According to Professor Richard Bouwens of Leiden Observatory in the Netherlands: "We're seeing these galaxies - 'star cities' - that are building themselves up over cosmic time."
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