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Astrophysics Data System
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<p>The SAO/NASA Astrophysics Data System (ADS) is a <a href="/facts/Digital_library/aBCP81In">digital library</a> portal for researchers on <a href="/facts/Astronomy/0ArJVM1p">astronomy</a> and <a href="/facts/Physics/a7aH2y08">physics</a>, operated for <a href="/facts/NASA/TIMCV0yV">NASA</a> by the <a href="/facts/Smithsonian_Astrophysical_Observatory/1Bz2ApPt">Smithsonian Astrophysical Observatory</a>. ADS maintains three bibliographic collections containing over 15 million records, including all <a href="/facts/ArXiv/H6EtgnBe">arXiv</a> e-prints. Abstracts and full-text of major astronomy and physics publications are indexed and searchable through the portal. </p>