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Gaia finds parts of the Milky Way much older than expected

The colour of the sky from Gaia’s Early Data Release 3

Using data from ESA’s Gaia mission, astronomers have shown that a part of the Milky Way known as the ‘thick disc’ began forming 13 billion years ago, around 2 billion years earlier than expected, and just 0.8 billion years after the Big Bang.

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