American Astronaut Dr. Shannon W. Lucid and Mr. John Hall, Director of Export Control and Interagency Liaison of the National Aeronautics and Space Administration (NASA) are visiting Poland from October 1-5, 2007 to participate in conferences and speaking events in commemoration of fifty years of space exploration. Lucid and Hall will participate in the international conference commemorating fifty years of space exploration organized by the Polish Academy of Science and Warsaw University of Technology on October 2-3, 2007.