VizieR
vizier.u-strasbg.frCompetitors
6 competitors
NASA/IPAC Extragalactic Database (NED)
ned.ipac.caltech.edu
Simbad Astronomical Database
simbad.u-strasbg.fr
NASA ADS (Astrophysics Data System)
ui.adsabs.harvard.edu
SkyServer (SDSS)
skyserver.sdss.org
PAGES (Physics and Astronomy Classification Scheme) Data Repository
ppages.physics.org
MAST (Mikulski Archive for Space Telescopes)
archive.stsci.edu
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