Updated: 1/15/2020
CDS (the Center de Données astronomiques de Strasbourg), http://cdsweb.u-strasbg.fr. Designed to collect, process, and distribute astronomical data from a variety of sources about objects located outside the solar system. Supported by the Strasbourg Astronomical Observatory, France. It includes 3 sites: SIMBAD, VizieR, Aladin, which are linked to each other and to other sites (including the extrasolar planets directory and NASA sites).