CAPE CANAVERAL, Fla. - In the Operations and Checkout Building at NASA's Kennedy Space Center in Florida, some of the participants and invited guests of the Conference on the American Space Program for the 21st Century pose for a group portrait. From left are Neil deGrasse Tyson, director, Hayden Planetarium, American Museum of Natural History; Bill Nye The Science Guy, engineer and television personality; Jim Bell, professor, Department of Astronomy, Cornell University; Scott Hubbard, former director, NASA's Ames Research Center; and Louis Friedman, founder and executive director, The Planetary Society. President Barack Obama opened the Conference on the American Space Program for the 21st Century with remarks on the new course his administration is charting for NASA and the future of U.S. leadership in human spaceflight. Photo credit: NASA_Jim Grossmann