Astrophysics Data System

The SAO/NASA Astrophysics Data System is an online database of over 16 million astronomy and physics papers that are both from peer reviewed and non-peer reviewed sources. Abstracts are... Wikipedia

• Producer:  Smithsonian Astrophysical Observatory for the National Aeronautics and Space Administration (United States)
• History:  1992 to present
• Cost:  Free
• Disciplines:  Astronomy and physics
• Record depth:  Index & abstract & full-text
• Geospatial coverage:  Worldwide
• Data source:  DuckDuckGo