Physics

NASA Astrophysics Data System draws abstracts from a variety of national and international scientific sources. The abstracts are divided into four sets: astronomy and astrophysics, instrumentation, physics and geophysics, and the ArXiv Preprints archive.

NASA Technical Report Server NTRS provides access to NASA's current and historical technical literature including: conference papers, images, journal articles, photos, meeting papers, movies, patents, research reports, and technical videos.

The National Science Digital Library is a digital library of educational resources for social science, science, technology, engineering and mathematics. For all education levels, elementary through higher education.

Science.gov is a gateway to science information resources of the U.S. government. Users can search both government web sites and government databases. Full-text available.