2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/144691Illuminating the nature of dark energy is one of the most important challenges in cosmology today. In this review I discuss several promising observational approaches to understanding dark energy, in the context of the recommendations by the U.S. Dark Energy Task Force and the ESA-ESO Working Group on Fundamental Cosmology.12 pages. Invited review at the 23rd International Symposium on Lepton and Photon Interactions at High Energy (LP07)AstrophysicsHigh Energy Physics - Phenomenologytext