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4MIDABLE-LR will provide the largest spectroscopic follow-up of Gaia, providing a detailed 3D chrono-chemokinematical map of stellar disk and bar-bulge of the Milky Way.
By measuring precise positions and motions, the ESA satellite Gaia creates the most accurate map of the Milky Way to answer questions about origin and evolution of our galaxy.
The RAdial Velocity Experiment was a survey to measure the radial velocities, metallicities and abundance ratios for nearly half a million stars. The data are available via the project website.
The Sloan Digital Sky Survey has created the detailed images of 1/3 of the sky in the visible wavelength range as well as three-dimensional maps of the Universe and spectra for more than three million astronomical objects.