The NASA Astrophysics Data System (usually referred to as ADS) is an online database of over 7,000,000 astronomy and physics papers from both peer reviewed and non-peer reviewed sources.Abstracts are available free online for almost all articles, and full scanned articles are available in GIF and PDF format for older articles.
New articles have links to electronic versions hosted at the journal's webpage, but these are typically available only by subscription (which most astronomy research facilities have). It is managed by the
Literature searches which previously would have taken days or weeks can now be carried out in seconds via the sophisticated ADS search engine, which is custom-built for astronomical needs. Studies have found that the benefit to astronomy of the ADS is equivalent to several hundred million US dollars annually and the system is estimated to have tripled the readership of astronomical journals.
Use of ADS is almost universal among astronomers worldwide, and therefore ADS usage statistics can be used to analyse global trends in astronomical research. These studies have revealed that the amount of research an astronomer carries out is related to the GDP per capita of the country in which they are based and that the number of astronomers in a country is proportional to the GDP of that country, so the amount of research done in a country is proportional to the square of its GDP divided by its population.
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