Original story: SpaceX is launching a rocket this afternoon. The live webcast begins at 12:45 PST and the launch itself is scheduled for 1:58.
NASA TV is streaming coverage:
The Dragon spacecraft is headed for the International Space Station. The unmanned mission is delivering cargo, including scientific experiments from NASA's Ames Research Center in Silicon Valley.
SpaceX, owned by Tesla Motors CEO Elon Musk, is a private space company. You can learn more about private space exploration in our TV special, Silicon Valley Goes to Space.