Solar Impulse, the world's first completely solar powered aeroplane, is about to start its first night flight.
The dragonfly-like plane has reached its planned altitude, its batteries are fully charged and all is ready for the night, according to pilot Andre Borschberg, speaking live from his cockpit 28,000 feet above Switzerland.
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The Solar Impulse aims to fly around the world using only solar energy to power the plane.
The plane was designed, modelled and built in silicon using Dassault Systèmes computer-aided development and manufacturing software before any parts were ordered.
You can follow the flight in real time from Solar Impulse's website.