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Contains astronomy resources, space data archives, visitor information, and research opportunities.

Formed in 1954, the American Astronautical Society (AAS) is the premier independent scientific and technical group in the United States exclusively dedicated to the advancement of space science and exploration.

Developer of a range of spacecraft and scientific payloads providing project overviews, scientific and engineering articles.

Comprehensive directory covering space from earth to the edge of the universe.

SpaceRef is a space news and reference site. This includes space exploration and missions, a space calendar of events, interactive space news and a space directory and search engine.