Physics: Astronomy and Space Science

National Aeronautics and Space Administration

provides access to aerospace-related citations, full-text online documents, images, and videos.

is a digital library portal for researchers in astronomy and physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant.

based in Baltimore, USA, operated by Association of Universities for Research in Astronomy.

is an international non-profit organization aims to enable anyone, anywhere, to participate in scientific discovery through variable star astronomy.

s an internet based short notice publication service for quickly disseminating information on new astronomical observations.

is community-supported thesaurus which unifies the existing divergent and isolated Astronomy & Astrophysics thesauri into a single high-quality, open thesaurus formalizing astronomical concepts and their inter-relationship.

Web book

Interactive software

International astronomical news through images, videos, blogs, audio/video podcasts, and RSS feeds. View a variety of types of graphic data: live telescope observations, positioning of key spacecraft, a calendar of upcoming near-Earth objects, views of sunspots, details about extrasolar planets, and various pictures of the day.