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American Institute of Aeronautics and Astronautics (AIAA)
Artemis Society
Astronomy Picture of the Day
Challenger Center for Space Science Education
For Inspiration and Recognition of Science and Technology (FIRST)
Franklin Institute Space Science Hotlist
Lehigh Valley Space Frontier
The Moon Society - Moon Miners' Manifesto
The Manned Lunar Landing in 1969
SETI League (Search for Extra-Terrestrial Intelligence)
Students for the Exploration and Development of Space (HS & college)
U.S. Space Camp