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The Milky Way, coming into focus: Precision astrometry probes its evolution and its dark matter

Yanny, Brian; Gardner, Susan; McDermott, Samuel D.

The growing trove of precision astrometric observations from the Gaia space telescope and other surveys is revealing the structure and dynamics of the Milky Way in ever more exquisite detail. We summarize the current status of our understanding of the structure and the characteristics of the Milky Way, and we review the emerging picture: the Milky…