A three-hour countdown begins to another historic moment for China. Three Chinese astronauts, or taikonauts, Zhai Zhigang, Wang Yaping and Ye Guangfu, who are tasked for a six-month space trip, will head onboard the Shenzhou-13 spacecraft to the core module of China's space station. The spacecraft will aim to take off at 00:23 Beijing Time on October 16.