2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/8743Conference Summary4 pages, to appear in the Proceedings of the Symposium "The Three-dimensional Universe with Gaia", 4-7 October 2004, Observatoire de Paris-Meudon, France, eds: C. Turon, K.S. O'Flaherty, M.A.C. Perryman (ESA SP-576)Astrophysicstext