VIDEO: Take-off for Solar Impulse 2

Solar Impulse, a plane powered entirely by the sun, has taken off on the final and most difficult leg of its mission to fly a solar plane around the world.

It is expected to take six full days and nights to make the journey from China to Hawaii.

John Sudworth reports.

Article source: http://www.bbc.co.uk/news/science-environment-32945433#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

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