But traveling to mars is more difficult. It is 35 million miles away Franklin Chang Diaz, a formor NASA scientist, is developing a rocket that will send a shuttle into space at the speed of 55 kilometers per second.
But traveling to mars is more difficult.It is 35 million miles away Franklin Chang Diaz, a formor NASA scientist, is developing a rocket that will send a shuttle into space at the speed of 55 kilometers per second.