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In the past decades, studies of the Milky Way have entered a golden era of large-scale surveys. The Gaia satellite provides precise positions, proper motions, and parallaxes for billions of stars, while ground-based spectroscopic surveys, such as LAMOST, deliver radial velocities and metallicities for nearly ten million stars. In addition, medium-

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The remarkable success of recent cosmology in pinpointing a consistent concordance model relies on several foundational assumptions, including homogeneity, isotropy of the universe, and scale invariance, among others. Increasingly precise cosmological observations, such as the exquisite measurements of the CMB sky from the ESA Planck space mission

During the last few decades, we've begun to glimpse the universe not just with photons, but also with other messengers like cosmic rays, neutrinos, and even gravitational waves. I will show why photons, cosmic rays, and neutrinos are fundamentally interconnected—as dark matter may also be—and why very-high-energy gamma rays are a key domain in