Astronomical Repositories
  Astronomical Repositories serve as vital resources for researchers, educators, and astronomy enthusiasts, providing access to invaluable data across multiple wavelengths and celestial phenomena. Below is a comprehensive list of notable astronomical repositories , along with their web URLs and brief descriptions:    Repository Name  Website  Description      NASA/IPAC Extragalactic Database (NED)  https://ned.ipac.caltech.edu/  A database providing extensive information about extragalactic objects, including galaxies, quasars, and clusters, with cross-references.    SIMBAD Astronomical Database  http://simbad.u-strasbg.fr/  A comprehensive database for identifying and querying astronomical objects like stars, galaxies, and exoplanets.    Vizier Catalog Access Tool  https://vizier.u-strasbg.fr/  Offers access to thousands of astronomical catalogs and tables, covering all domains of astronomy.    Aladin Sky Atlas  https://aladin.u-strasbg.fr/  An interactive sky atlas for visualizin...