SpaceX set to launch a critical test flight for NASA
The last time NASA astronauts flew to the International Space Station on an American spacecraft was nearly eight years ago. Since then, NASA has relied on Russia for rides. That could soon change. On Saturday morning, SpaceX will launch its new spaceship on a critical test flight, marking the first time a commercially built and operated spaceship, capable one day of carrying people, will travel to the space station. Mark Strassmann reports.