The NASA Authorization Act of 2005 is an act of the United States Congress. It was signed by the then President George W. Bush and became Public Law 109-155 on December 30, 2005. The act requires NASA to carry out a balanced set of programs in human spaceflight, in aeronautics research and development and in scientific research. The act directs NASA to send robotic spacecraft to study the Moon and planets, and to study astronomy and astrophysics. The act directs NASA to use research satellites to conduct earth science research and research on the Sun-Earth connection. The act also directs NASA to support university research in a variety of fields.