Solar powered plane nears final destination on historical circumnavigation of the world
The first circumnavigation of the earth by a solar-powered plane faces one final hazard on the last leg of its epic journey: too much sun. Solar Impulse 2, which started its adventure in March 2015, is now making its final flight between Cairo and Abu Dhabi, flying partly in darkness using energy stored in 17,000 solar cells in its huge wings. The flight to Abu Dhabi is expected to take 48-72 hours, but the plane will be flying across the deserts of North Africa and the Middle East which present new problems.
