Results from the AMANDA Neutrino Telescope

High-energy neutrinos are very promising probes for Astrophysics. Neutrinos interact very weakly, so they are unique sources of information at high energies. However, since they interact very rarely, very large detectors are needed to observe them. The detection principle in a neutrino telescope is based on the observation of the Cherenkov light produced by the muons generated in the interactions of muon neutrinos. Other signatures, such as cascades from electrons produced by electron neutrinos, are also identifiable. AMANDA-II, with 677 optical sensors, has demonstrated the feasibility of such a detector in the Antarctic ice and provided important Physics results. In this presentation we will review this scientific output, which includes the first sky map using neutrinos from the Northern Hemisphere, the measure of the atmospheric neutrino spectrum, the study of astrophysical objects like gamma-ray bursts, active galactic nuclei, soft-gamma repeaters or supernovae and limits on the neutralino flux from the Sun and the Earth.