2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/205141This paper reviews the theory, phenomenology, and observational constraints on the coupling parameters of Einstein-aether gravity, i.e. General Relativity coupled to a dynamical unit timelike vector field. A discussion of open questions concerning both phenomenology and fundamental issues is included.18 pages, for the proceedings of the conference "From Quantum to Emergent Gravity: Theory and Phenomenology", June 11-15 2007, SISSA; Trieste, Italy; v.2: added brief comments on observability of wave speeds and polarizations, and how neutron star and black hole "sensitivities" might be computedGeneral Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext