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Sigma Pi Sigma exists to honor outstanding scholarship in physics and astronomy, to encourage interest in physics and astronomy among students at all levels, to promote an attitude of service, and to provide a fellowship of persons who have excelled in physics and astronomy. Membership is a lifelong and includes a once-year complimentary membership in the Society of Physics Students (SPS).
Sigma Pi Sigma is an organization of the American Institute of Physics, and a member of the Association of College Honor Societies. Founded in 1921, there are more than 100,000 historical members.