An open archive of scientific papers including, but not limited to: Cosmology and Extragalactic Astrophysics; Earth and Planetary Astrophysics; Galaxy Astrophysics; High Energy Astrophysical Phenomena; Instrumentation and Methods for Astrophysics; and Solar and Stellar Astrophysics. In other words, more articles than you can shake a stick at.
Scopus is an abstract and citation database of peer-reviewed research literature, indexing over 19,000 titles from more than 5,000 international publishers. Scopus covers the scientific, technical, medical and social sciences fields as well as arts and humanities. Scopus includes scholarly journals, book series, conference proceedings, trade publications and Open Access journals.
Just like Google except this search engine crawls a corpus of scholarly articles. A good place to begin a search, especially a broad one. Result sets are typically large and unwieldy, making Scopus a better source for focused queries.
Covers applied science topics in astronomy, including space technology and astronautics. Full text of articles from more than 220 periodicals dating back to 1992 and abstracts for core publications since 1983.
Includes full text with mathematics and graphics and a variety of practical and time-saving features, including: powerful searching and browsing, a range of viewing and printing options, and valuable personalization features.