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[email protected] March 15, 2018 Dr. France A. Córdova, Director National Science Foundation 2415 Eisenhower Avenue, Suite 19000 Alexandria, VA 22314 Mr. Robert M. Lightfoot, Jr., Acting Administrator Office of the Administrator NASA Headquarters Washington, DC 20546-0001 Mr. Richard Perry, Secretary of Energy U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 The Honorable John Thune, Chairman Committee on Commerce, Science and Transportation United States Senate Washington, DC 20510 The Honorable Lisa Murkowski, Chairwoman Committee on Energy & Natural Resources United States Senate Washington, DC 20510 The Honorable Lamar Smith, Chairman Committee on Science, Space and Technology United States House of Representatives Washington, DC 20515 Dear Dr. Córdova, Mr. Lightfoot, Secretary Perry, Chairman Thune, Chairwoman Murkowski, and Chairman Smith: I am pleased to transmit to you the annual report of the Astronomy and Astrophysics Advisory Committee for 2017. The Astronomy and Astrophysics Advisory Committee was established under the National Science Foundation Authorization Act of 2002 Public Law 107-368 to: (1) assess, and make recommendations regarding, the coordination of astronomy and astrophysics programs of the Foundation and the National Aeronautics and Space Administration, and the Department of Energy; Arizona’s First University – Since 1885 Dr.