2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/5564New observations of Cosmic Microwave Background Anisotropies, Supernovae luminosity distances and Galaxy Clustering are sharpening our knowledge about dark energy. Here we present the latest constraints.4 pages, 2 figures, to appear in proceedings of the XVIIIth IAP Colloquium `On the Nature of Dark Energy', IAP, ParisAstrophysicsDark Energy: Is it Q or Lambda ?text