Shenzhou 3 launched on March 25, 2002, was the third unmanned launch of China's Shenzhou spacecraft. This was the first Shenzhou spacecraft launched that could have actually carried a human and as such the main objective of the mission was to test the systems required to support a human in space. On board it carried a dummy to simulate physiological signals of a human — palpitation, pulse, breathing, eating, metabolism, and excretion.