Solar Impulse 2 (Si2), the world’s first solar-powered plane is getting ready for its historic flight from China to Hawai this week. Piloted by Andre Borschberg, the 8175-kilometer Pacific crossing flight, may take off from Nanjing in eastern China, if weather permits. Borschberg, 62, will fly the Si2 by himself during five days and five nights, above the Pacific Ocean. This will be the seventh of 12 flights.