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Submission + - Can a solar-powered plane fly around the world in 25 days?

stephendavion writes: The Solar Impulse 2 aircraft relies on solar energy to get around and its pilots want to take it on a trip around the world. Weighing over 2,260 kilos (5,000 pounds) and with a wingspan of more than 70 metres (240 feet), Solar Impulse 2 made its maiden flight on June 2, 2014. The aircraft flew for two hours and 17 minutes without complications at a speed of 55.6 km/h, and the test pilot was Markus Scherdel.

Now, following in the footsteps of Phineas Fogg in then iconic book Around the World in 80 Days, pilots Bertrand Piccard and Andre Borschberg plan to take Solar Impulse 2 for a trip around the globe beginning on March 2015.

Will they be able to pull it off? With 17,000 solar cells to power four electric motors and spin the propellers, the pilots say they can do it in 25 days and nights, or 500 hours of flying non-stop.
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Can a solar-powered plane fly around the world in 25 days?

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"Yeah, but you're taking the universe out of context."