Days after receiving a contract to build spacecraft that will ferry astronauts to the International Space Station, SpaceX launched its Dragon spacecraft, loaded with supplies and scientific experiments to the orbiting station.

This marks the fourth mission that SpaceX, a company that says it one day wants to build cities on Mars , has flown to the space station. Its first test flight launched in May 2012.

“There’s nothing like a good launch. It’s just fantastic,” said Hans Koenigsman, vice president of Mission Assurance for SpaceX, in a statement. “From what I can tell, everything went perfectly.”

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