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In recent years, high-energy astrophysics has made impressive advances, revealing a turbulent cosmos full of surprising phenomena. From supermassive black holes that inhabit the center of most galaxies, to colossal stellar explosions with dozens of times the mass of the Sun, or neutron stars that act in unexpected ways in binary systems. These discoveries have been made possible thanks to the power of gamma-ray telescopes, both in space and on Earth, such as Fermi-LAT. In addition, gamma rays could be the key to unraveling one of the greatest mysteries of modern science: the nature of dark matter, which is believed to represent more than 80% of the matter in the Universe, although it remains largely unknown. In this talk, Miguel Ángel Sánchez-Conde, researcher at the Institute of Theoretical Physics (IFT UAM-CSIC), professor at the Autonomous University of Madrid (UAM) and scientific coordinator of the Fermi LAT collaboration, opens a window to the understanding of these energetic phenomena. Sánchez-Conde's current research focuses mainly on the search for dark matter via gamma rays. He is the scientific coordinator of the Fermi-LAT collaboration, where he coordinates the dark matter science working group, and is also part of the Cherenkov Beam Telescope (CTA) Consortium. Previously, he was a member of the MAGIC Collaboration and recently joined the Dark Energy Spectroscopic Instrument (DESI) Collaboration. His areas of interest include the search for dark matter via gamma rays, the study of diffuse gamma-ray backgrounds, the investigation of axion-like particles, the analysis of halos and subhalos in the context of the cold dark matter (CDM) model, and the use of numerical cosmological simulations to explore these phenomena. This lecture was given on September 18, 2024 at the Residencia de Estudiantes del CSIC in the context of a set of events to disseminate the science of Albert Einstein, a project funded by the Spanish Federation of Science and Technology (FECYT). Production: Residencia de Estudiantes. Follow us on TWITTER! / ift_uam_csic INSTAGRAM! / ift_madrid TikTok! / ift_uam_csic Also on FACEBOOK! / iftmadrid We are now on Bluesky! https://bsky.app/profile/iftuamcsic.b... And check out our website! https://www.ift.uam-csic.es