space ex and other new commercial companies are promising safer, more reliable space flight for less, a lot less money. space ex says it could fly an astronaut to the international space station for $30 million less than the russians. but is this new industry mature enough yet to deliver? >> i think we'll get there. i don't know how long it's going to take, what it's going to cost, and not just dollars, but possibly in lives and in aspirations. >> reporter: nasa's banking on space x and other companies to replace the retiring shuttle for flights to the space station. that would free up nasa to develop new technologies to get humans to mars and the asteroids, but it's a risky plan. the accident could set the fledgling -- to the station