Double Star mission
From Spacefaring
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Double Star was a joint satellite based space mission by the China National Space Administration (CNSA) and the European Space Agency (ESA). It was the first space mission launched by China to investigate Earth's magnetosphere. It consisted of two satellites: an Equatorial satellite (TC-1) and Polar satellite (TC-2). Double Star followed in the footsteps of ESA's Cluster mission by studying the effects of the Sun on the Earth's environment. After a nominal mission of one year, the Double Star mission was extended twice by both agencies until the end of September 2007.