2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148517The case is simple: there is no compelling theoretical argument against a cosmological constant and LambdaCDM is the only CDM model that is consistent with all present observations. LambdaCDM has two noteworthy features: it can be falsified in the near future (the prediction q_0 sim -0.5 is an especially good test), and, if correct, it has important implications for fundamental physics.9 pages LaTeX with 5 eps figures. To be published in Critical Dialogues in Cosmology, edited by N. Turok (World Scientific). Revised version contains all five figuresAstrophysicsHigh Energy Physics - Phenomenologytext