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The '''SAO/NASA Astrophysics Data System''' ('''ADS''') is an [[online database]] of over 15 million records of publications developed by the [[National Aeronautics and Space Administration]] (NASA) on [[Astronomy & Astrophysics|astronomy]] and [[physics]]. [[abstract (summary)|Abstracts]] are freely available for most articles, and fully scanned articles may be available in [[Graphics Interchange Format]] (GIF) and [[Portable Document Format]] (PDF). Hosted papers may be from [[peer review]]ed or non-peer-reviewed sources. In addition to this, the database also hosts abstracts from esteemed international conferences and accepted telescope observation proposals (for example, from the James Webb Space Telescope). ADS is managed by the [[Smithsonian Astrophysical Observatory]].
Beginning in 1992, ADS is a research tool that improves astronomical research, and is specifically tailored to astronomical needs.<ref name="announcement">{{cite journal |last=Kurtz |first=M.J. |display-authors=et al. |year=1993 |title=Intelligent Text Retrieval in the NASA Astrophysics Data System |journal=Astronomical Data Analysis Software and Systems II |volume=52 |page=132 |bibcode=1993ASPC...52..132K}}</ref> The monetary benefit to astronomy that ADS contributes is equivalent to several hundred million in [[USD|US dollars]] every year (2005).<ref name="overview" /><ref name="impact">{{cite journal |last=Kurtz |first=M.J. |author2=Eichhorn G. |author3=Accomazzi A. |author4=Grant C.S. |author5=Demleitner M. |author6=Murray S.S. |year=2005 |title=Worldwide Use and Impact of the NASA Astrophysics Data System Digital Library |journal=Journal of the American Society for Information Science and Technology |volume=56 |issue=1 |pages=36–45 |arxiv=0909.4786 |bibcode=2005JASIS..56...36K |doi=10.1002/asi.20095 |s2cid=15181632}} ([http://cfa-www.harvard.edu/~kurtz/jasis-abstract.html Preprint])</ref>
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