2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52079The status of accelerating four-dimensional universes obtained by time-dependent compactifications of 10 or 11 dimensional supergravity is reviewed, as is the `no-go' theorem that they evade. All flat cosmologies for a simple exponential potential are found explicitly. It is noted that transient acceleration is generic, and unavoidable for `flux' compactifications. Included is an eternally accelerating flat cosmology without a future event horizon.10 pp. Latex. Minor corrections made and Ref. added. To appear in proceedings of ICMP2003, Lisbon, Portugal, July 2003High Energy Physics - Theorytext