2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2301The basic observed properties of neutron stars are reviewed. I suggest that neutron stars in low-mass X-ray binaries are the best of all known sites for testing strong-field effects of general relativity.Lectures given at the Mexican School of Astrophysics, Guanajuato, August 1999Astrophysicstext