In 2015, pilots Bertrand Piccard and André Borschberg, on their solar-powered aircraft, the Solar Impulse 2, set out on a quest to do the impossible: Be the first to go around the world in full circle...without using any fuel.

Beginning their journey in Abu Dhabi, the team just landed in the Phoenix area Monday night, where spectators were eager to see the Solar Impulse 2 accomplish its tenth leg of its solar flight.

The tenth leg, which started from Silicon Valley, was approximately a 1,200 km (745 miles) trip that took about 16 hours, with the aircraft reaching a maximum altitude of around 6,700 km (22,000 ft).

The Solar Impulse 2 runs solely on clean technologies, primarily using 17,000 solar cells to keep it in flight. According to the team's blog, Solar Impulse 2 won't be flying again until next Monday, so they've set up a public visit day scheduled this Saturday, May 7.

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