Among the returned investigations was the Coarsening in Solid-Liquid Mixtures (CSLM-3) experiment, which also launched to space aboard this Dragon. CLSM-3 studies how crystals known as dendrites form as a metal alloy becomes solid. The research could help engineers develop stronger materials for use in automobile, aircraft and spacecraft parts.Dragon also is returning several human research samples that will help scientists continue to examine how the human body reacts to long-term spaceflight. The results will have implications for future space exploration and direct benefits here on Earth. The mission was the second of at least 12 cargo resupply trips SpaceX plans to make to the space station through 2016 under NASA's Commercial Resupply Services contract. SpaceX is one of two companies to build and test new cargo spacecraft under NASA's Commercial Orbital Transportation Services (COTS) program. Orbital Sciences Corp. of Dulles, Va., is the other company participating in COTS. A demonstration flight of Orbital's Antares rocket and Cygnus spacecraft to the station is planned for later this year. NASA initiatives such as COTS and the agency's Commercial Crew Program are helping develop a robust U.S. commercial space transportation industry with the goal of achieving safe, reliable and cost-effective transportation to and from the space station and low Earth orbit. In addition to cargo flights, NASA's commercial space partners are making progress toward a launch of astronauts from U.S. soil in the next few years. While NASA works with U.S. industry partners to develop and advance these commercial spaceflight capabilities, the agency also is developing the Orion spacecraft and the Space Launch System (SLS), a crew capsule and heavy-lift rocket to provide an entirely new capability for human exploration. Designed to be flexible for launching spacecraft for crew and cargo missions, SLS and Orion will expand human presence beyond low Earth orbit and enable new missions of exploration in the solar system.