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Loading contentThe reconstruction of how the Milky Way formed by reading the ages, chemistry, and motions of its stars, which preserve the imprint of their birth. Gaia's precise positions and velocities for over a billion stars have turned this into a precision science, revealing ancient mergers frozen into the halo.
Facts on this topic will be cited from these primary and reference sources.
Southern-hemisphere observatory data and imagery (VLT, ALMA partner).