2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85045The serious study of such science fiction staples as wormholes, time travel, and the warp drive, as a means of understanding and constraining possible realistic solutions within General Relativity is reviewed.10 pages LaTeX; to appear in Phi Kappa Phi ForumSpace PhysicsPopular Physicstext