| http://www.w3.org/ns/prov#value | - In addition to the European Space Agency, nations including the United States, the former Soviet Union, Russia, the European Space Agency, China and Japan have sent missions to Mars since the late 1960s, but only about one-third of them have succeeded.The United States is the only nation to land a vehicle on Mars and complete its mission, having done it six out of seven tries.
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