The Chinese space program is one of the world's most active. In 1970, China launched its first satellite, Dong Fang Hong I, becoming the fifth country to do so independently. In 2003, China became the third country to independently send humans into space, with Yang Liwei's spaceflight aboard Shenzhou 5; , thirteen Chinese nationals have journeyed into space, including two women. In 2011, China's first space station module, Tiangong-1, was launched, marking the first step in a project to assemble a large crewed station by the early 2020s. In 2013, China successfully landed the Chang'e 3 lander and Yutu rover onto the lunar surface. In 2016, the first quantum science satellite was launched in partnership with Austria dedicated to testing the fundamentals of quantum communication in space. In 2019, China became the first country to land a probe—Chang'e 4—on the far side of the moon. In 2020, the first experimental 6G test satellite was launched and Chang'e 5 successfully returned moon samples to the Earth, making China the third country to do so independently after the United States and the Soviet Union. In 2021, China became the second nation in history to independently land a rover (Zhurong) on Mars, joining the United States.