SpaceX Dragon capsule is shown on the end of the International Space Station's robotic arm on Sunday, March 3, 2013. SpaceX, the California-based company founded by billionaire Elon Musk, had to struggle with the Dragon following its launch Friday from Cape Canaveral. The spacecraft is delivering more than 1 ton of supplies to the the space station. (AP Photo/NASA TV)

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SpaceX Dragon capsule is shown on the end of the International Space Station's robotic arm on Sunday, March 3, 2013. SpaceX, the California-based company founded by billionaire Elon Musk, had to struggle with the Dragon following its launch Friday from Cape Canaveral. The spacecraft is delivering more than 1 ton of supplies to the the space station. (AP Photo/NASA TV)