| ADS | Digital Library for Physics and Astronomy |
| SIMBAD | Astronomical Database |
| DSS | Digitized Sky Survey |
| ALADIN | The Aladin Interactive Sky Atlas |
| TOPCAT | Tool for Operations and Catalogues and Tables |
| HEASARC | High Energy Astrophysics Science Archive Research Center |
| MAST | Multimission Archive |
| NIST | National Institute of Standards and Technology |
| NUDAT | National Nuclear Data Center |
| Old Telescope Websites | |
| DARC | Delaware Asteroseismic Research Center |
| Sternwarte Tübingen | Astronomische Vereinigung Tübingen AVT |
| Calar Alto | German-spanish Centre for Astronomy |
| ESO | |
| ESA | |
| NASA | |
| APOD | Astronomy Picture of the Day |
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