External Archives and Databases
AAVSO: American Association of Variable Star Observers
ADS: Astrophysics Data System (Harvard CfA)
APS/POSS: Automated Plate Scanner (U. Minnesota)
Astro-ph (Los Alamos National Lab)
COBE/DIRBE
DSS: Digital Sky Survey (STScI)
FIRST (VLA): Faint Images of the Radio Sky at Twenty-cm (STScI)
HEASARC: High-Energy Astrophysics Science Archive Center (NASA-GSFC)
HST: Hubble Space Telescope (STScI)
ISO: Infrared Space Observatory (ESA)
MSX: Midcourse Space Experiment (IPAC)
NVSS: NRAO VLA Sky Survey (NRAO/VLA)
PDS: Planetary Data System (JPL)
ROSAT: Roentgen Satellite, All-Sky X-ray Survey (MPE, Germany)
SDSS: Sloan Digital Sky Survey
SSDS: Space Science Data System
SIMBAD: Set of Identifications, Measurements, and Bibliography for
Astronomical Data (U. Strasbourg, France)