Archive (APDA), a site to help preserve astronomical photographic plates. These plates were the primary recording medium for astronomy data from the late 19th century until the 1980s. It is estimated that over two million of the plates are held in astronomy facilities around the world and are in jeopardy of being destroyed because of a lack of storage facilities. An Exhibit Gallery displays a collection of rare meteorites and minerals, as well as NASA Space Shuttle artifacts. Many of the latter are from space flights. See also List of astronomical observatories List of radio telescopes Notes General references Goldman, Stuart J. "Mission Possible: The Promise of Pisgah." Sky & Telescope. October 2001:42. Hargreaves, Lynley. "Spy Station Retooled into Astronomy Institute". Physics Today. March 2001 Volume 54, number 3. External links Pisgah Astronomical Research Institute (PARI) Virginia Tech Eight Meter Transient Array Astronomical observatories in North Carolina Radio telescopes Buildings and structures in Transylvania County, North Carolina University of North Carolina Pisgah National Forest Education in Transylvania County, North Carolina Tourist attractions in Transylvania County, North Carolina National Security Agency facilities