![World's largest solar-powered plane heads for Nanjing(7/7)](http://www.ecns.cn/hd/2015/04/21/ccb2de78c0774e20b07dafe97b74d001.jpg)
Solar Impulse 2 prepares to take off from Jiangbei International Airport in Chongqing Municipality, southwest China, April 21, 2015. Solar Impulse 2, the world's largest solar-powered plane, left Chongqing Tuesday morning and headed for Nanjing, capital of east China's Jiangsu Province. (Photo: Xinhua/Tang Yi)