The SAO/NASA Astrophysics Data System (ADS) is an online database of over 15 million records of publications developed by the National Aeronautics and Space Administration (NASA) on astronomy and physics. Abstracts are freely available for most articles, and fully scanned articles may be available in Graphics Interchange Format (GIF) and Portable Document Format (PDF). Hosted papers may be from peer reviewed or non-peer-reviewed sources. ADS is managed by the Smithsonian Astrophysical Observatory.

Astronomy & Astrophysics (A&A) is a monthly peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics. It is operated by an editorial team under the supervision of a board of directors representing 27 sponsoring countries plus a representative of the European Southern Observatory. The journal is published by EDP Sciences and the current editors-in-chief are Thierry Forveille and João Alves.