Americans have occupied the geographic South Pole
continuously since November 1956.
The Amundsen–Scott South Pole Station is the United States scientific research station at the South Pole. It is the southernmost point under the jurisdiction (not sovereignty) of the United States. The station has been continuously occupied since it was built and has been rebuilt, expanded, and upgraded several times.
The observatory is used for radio astronomy (listening for radio signals), radar astronomy (imaging inner Solar System asteroids etc.) and atmospheric science.
The Arecibo Observatory was built in 1963 by the U.S. Air Force under the initiative of Professor William Gordon in the Department of Electrical Engineering and his colleagues at Cornell. The initial funding was for the ARPA (United States Department of Defense (DoD) Advanced Research Projects Agency (ARPA) missile defense program.
