Houston, we have a landing. SpaceX's robotic Dragon capsule safely landed in the Pacific Ocean today, bringing 3,000 pounds of cargo back from its trip to the International Space Station. The unmanned capsule was loaded successfully onto a boat this afternoon, the company reported. NASA said that the material brought back by Dragon can help scientists study a number of things including how plant seedlings, the human body, semiconductors, and detergent are affected by life in microgravity.