The disarray in the U.S. space shuttle program after the Columbia disaster has left lawmakers wondering what the future of the country’s manned space program should be. Experts tell Congress that the expensive shuttle fleet and international space station are limiting the possibilities for human space exploration. On the day after China launched its first manned spacecraft, the House of Representatives Science Committee appealed to experts to provide a vision about where U.S. astronauts should go next in the solar system.