Weekender: Solar Impulse Plane

Solar Impulse 2 is an upgraded version of a solar-powered plane that flew across America in 2013. It gets all its energy from more than 17,000 solar cells installed on its fuselage, wings and tail — and can fly through the night, thanks to the power stored in more than 1,300 pounds (633 kilograms) of batteries. Its wings are as wide as those of a Boeing 747, but it weighs only about as much as a family car (2.6 tons).

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