But traveling to Mars is more difficult. It is 35 million milesaway! Franklin Chang Diaz,a former NASA scientist, is developing a rocket that will send a shuttle into space at the speed of 55 kilometers per secone. The trip from the Eart to Mars will ben reduced from 6to8 months to 39 days. NASA, the U.S. space agency, announced that someday people may even live on Mars. But before that happens, many questions will have to be answered.