Solar-Powered Plane

The U.S. military’s mystery space plane rocketed into orbit again Sunday, this time with an extra load of science experiments. It’s the sixth flight of an X-37B, a solar-powered plane that’s flown by remote control without a crew. Officials aren’t saying...

Early one morning last June, pilot André Borschberg stepped aboard an odd-looking plane — its wings long like those of an albatross, its cramped cabin as small as a refrigerator — and guided it into the sky above Japan. In...