Media Credit: Sam Klein | Photo EditorBuzz Aldrin spoke as part of the “Humans to Mars Summit,” hosted by the George Washington University Space Policy Institute. The second man to walk on the moon said Wednesday that the U.S. must take the lead to send humans to Mars. The summit, which included experts from technical, scientific and policy fields, was geared toward the challenges that need to be overcome to send humans to Mars by 2030. Other attendees included key players from NASA, industry sectors and the science community. News May 13, 2013 2:37 AM This article appeared in the May 13, 2013 issue of the Hatchet.