1785- , GeoRef, produced by the American Geological Institute, indexes the world's literature in geology and the geosciences. It also includes literature on extraterrestrial geology, geochemistry and geophysics.
The Planetary Data System (PDS) is a long-term archive of digital data products returned from NASA's planetary missions, and from other kinds of flight and ground-based data acquisitions, including laboratory experiments.
The High Energy Astrophysics Science Archive Research Center (HEASARC) is the primary archive for NASA's (and other space agencies') missions studying electromagnetic radiation from extremely energetic cosmic phenomena ranging from black holes to the Big Bang.
NED is a comprehensive database of multiwavelength data for extragalactic objects, providing a systematic, ongoing fusion of information integrated from hundreds of large sky surveys and tens of thousands of research publications. The contents and services span the entire observed spectrum from gamma rays through radio frequencies.
The Astronomy Image Explorer (AIE) has been designed as a convenient and efficient tool for researchers working in the fields of Astronomy and Astrophysics to gain access to images published in peer-reviewed journals. Users are able to easily search for images with any combination of author, journal, citation, format, and key words. Copyright information is conveniently embedded in each file downloaded from the site.