![World's largest solar-powered plane heads for Nanjing(6/7)](http://www.ecns.cn/hd/2015/04/21/70d3f09259f846e7a77ded34d37bdbc3.jpg)
Pilot Bertrand Piccard (R) of Solar Impulse 2 prepares for takeoff 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)