TL;DR
This review discusses how multi-epoch surveys, especially Gaia, have revolutionized our understanding of the Milky Way's structure, composition, and evolution through precise measurements of stars' positions, motions, and chemistry.
Contribution
It highlights the role of contemporary surveys like Gaia in providing unprecedented data that enhance our understanding of galactic structures and their history.
Findings
Gaia provides 3D positions for 1.3 billion stars.
Multi-epoch surveys enable detailed mapping of galactic components.
Stellar chemistry and motions reveal galaxy evolution patterns.
Abstract
A general overview of the understanding of our Galaxy is presented following the lines of its main structures: halo, disc, bulge/bar. This review is emphasising some "Time Domain Astronomy" contributions. On the one hand the distance and tangential motion of the stars are essential to this understanding and are obtained through multi-epoch surveys, on the other hand the chemistry of the stars, and their radial velocity are also key elements to map Galactic (sub-)structures and unravel their history and evolution. Contemporary surveys are revolutionising our view of the Milky Way and galaxies in general. Among these, the Gaia mission excels by its precision astrometry of 1.3 billion stars stretching through the Milky Way and beyond, providing the first 3D view of a major part of the Milky Way.
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