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Hidden History of the Milky Way Revealed by Extensive Star Maps

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Milky Way galaxy

Credit: ESA/Gaia/DPAC

Last April, Amina Helmi felt goose bumps while driving to work in the northern Netherlands. It had nothing to do with the weather—it was pure anticipation. Just days earlier, a flood of data had been released from Gaia, a European Space Agency (ESA) mission that has been mapping the Milky Way for five years.

From Nature
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