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NASA astronauts Bob Behnken and Doug Hurley returned to Earth from the International Space Station on Sunday, ending a historic mission testing human space flight operations for SpaceX hardware. The astronauts splashed down in the Gulf of Mexico off the coast of Floridau2019s Pensacola. u201cWelcome back to planet Earth, thanks for flying SpaceX,u201du00a0mission control said. The Demo-2 test flight for NASAu2019s Commercial Crew Program is the first to deliver astronauts to the International space Station and return them to Earth onboard a commercially built and operated spacecraft. Behnken and Hurley returned after spending 64 days in space. (AFP)