The recent data release from the Gaia space observatory is already changing our understanding of the evolution of our Galaxy.
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Belokurov, V. Gaia’s living and breathing Galaxy. Nat Rev Phys 1, 17–18 (2019). https://doi.org/10.1038/s42254-018-0009-z
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DOI: https://doi.org/10.1038/s42254-018-0009-z