Solar Impulse 2 takes off for Abu Dhabi in final leg of circumnavigation — in pictures

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Solar impulse 2 has taken off for the final time on its historic round-the-world trip using nothing but the power of the sun.

Piloted by the project's co-founder, Bertrand Piccard, Solar impulse 2 left Cairo at 3am UAE time and is expected to arrive in Al Bateen Airport in Abu Dhabi on Tuesday.