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+ NASA/IPAC Extragalactic Database (NED)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.

NASA Mission Directorates and Related Sites

+ Aeronautics Research Mission Directorate
+ Aviation International News External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ International Aerospace Information Network  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.

+ Exploration Systems Mission Directorate

+ Science Mission Directorate
+ AERADE (Aerospace and Defense Resources) Cranfield Univ.  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ ICSU Committee on Data for Science and Technology (CODATA)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Los Alamos National Lab arXiv e-Print Archive  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ SAO/NASA Astrophysics Data System (ADS)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.

+ Space Operations Mission Directorate
+ American Institute for Aeronautics and Astronautics (AIAA)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ NASA Human Space Flight
+ Spaceline Current Awareness  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.

+ NASA Education Program
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+ CENDI (Commerce, Education, Energy, NASA, Defense, Interior)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Defense Technical Information Center (DTIC)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Department of Defense (DOD)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Department of Energy (DOE)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Federal Depository Library Program  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Library of Congress  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Los Alamos National Laboratory (LANL)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ National Technical Information Service (NTIS)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Office of Scientific and Technical Information (OSTI)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
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International

+ Canada Institute for STI (CISTI)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Dutch Experiment Support Center  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ European Patent Office  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ European Space Agency (ESA)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ NATO's Research and Technology Organization (RTO)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.

Professional Organizations

+ American Institute of Physics (AIP)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Chemical Propulsion Information Analysis Center (CPIAC)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ IEEE Xplore  external link
+ Space Frontier Foundation  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.

Space News Links

+ Space News  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Spaceflight Now  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ SpaceWeather.com  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Universe Today  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.

Other Thesauri / Vocabulary

+ American Institute of Physics Physics and Astronomy Classification Scheme (PACS)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ American Mathematical Society Mathematics Subject Classification  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Defense Technical Information Center (DTIC) Thesaurus  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ DOD Dictionary of Military Terms  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ DTIC Science and Technology Subject Categories  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Library of Congress Thesauri  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ National Library of Medicine Medical Subject Headings (MeSH)  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ Photonics Dictionary  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.
+ WordNet – a Lexical Database for English  External link: You will leave the nasa.gov domain and enter a site that is not maintained by NASA.

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