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In 1986 the Society, which had grown to about 10,000 members, merged with the 25,000 member National Space Institute, founded by German rocket engineer and Project Apollo program manager Wernher von Braun of NASA's Marshall Space Flight Center to form the present-day National Space Society.
The National Space Society was established in the United States on March 28, 1987, by the merger of the National Space Institute, founded by Dr. Wernher von Braun, and the L5 Society, based on the concepts of Dr. Gerard K. O'Neill.