Historic solar flight marks first round-the-world journey

ABU DHABI, United Arab Emirates (AP) — The world’s first round-the-world flight to be powered solely by the sun’s energy made history Tuesday as it landed in Abu Dhabi, where it first took off on an epic 25,000-mile (40,000-kilometer) journey that began more than a year ago.
Since its March 2015 take off, the Swiss-engineered Solar Impulse 2 has made 16 stops across the world without using a drop of fuel to demonstrate that using the plane’s clean technologies on the grou