The Planetary Science Institute is a nonprofit science research institute focusing on the exploration of the solar system. Our scientists are distributed in 15 states, the UK, Switzerland, Russia, and Australia. We are headquartered in Tucson, Arizona, where PSI was founded in 1972. We are involved in numerous NASA missions, the study of Mars, asteroids, comets, interplanetary dust, impact physics, the origin of the solar system, planet formation about other stars, dynamics, the rise of life, and other subjects. PSI scientists conduct field work in North America, Australia and Africa. They are also actively involved in science education and public outreach through school programs, children's books, popular science books and art.

In 2004, PSI purchased a building for its corporate headquarters in Tucson. Continued PSI growth has resulted in expansion into additional space, leased nearby (the West Wing). Map and directions. PSI has a field trip program office in Laguna Niguel, California. PSI is a California corporation, organized under 501(c)(3). The Board of Trustees is its governing body. The PSI Director is Mark V. Sykes.

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