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Solar Impulse 2, a solar-powered airplane, finished its historic trip around the world, which started back in March 2015. The plane landed in Abu Dhabi early Tuesday.

André Borschberg (left) and Bertrand Piccard (right) celebrate after Solar Impulse 2 landed in Abu Dhabi, completing an historic trip around the world.Photo credit: Solar Impulse, Flickr

Solar Impulse traveled around the world, breaking the journey down into 17 legs, spending a total of 23 days in the air. The plane, powered by 17,000 solar cells, traveled 42,000 kilometers (about 26,100 miles) in a little more than a year. Its trip across the Atlantic Ocean from New York City to Seville, Spain, alone took approximately 90 hours to complete, traveling at 140 km/h (about 87 mph). The plane's longest trip was from Japan to Hawaii, which lasted almost five days.

Bertrand Piccard and André Borschberg alternated piloting the solar-powered plane. On the ground, they were helped by a team of 30 engineers, 25 technicians and 22 navigation controllers.

After landing in Abu Dhabi, Piccard called the journey not only an achievement for the history of aviation, but a success for the history of energy. The pilots hope their journey promotes investment in clean energy.

"If we want a good quality of life today, we have to turn to clean technology and renewable energies," Piccard said.

"If governments had the courage to promote clean technologies on a massive scale, our society could simultaneously reduce its dependence on fossil fuels, create jobs and stimulate sustainable growth."

Piccard and Borschberg never had a shortage of views during their trip. Solar Impulse 2 was subject to amazing views, clean energy innovations and some of the world's most challenging problems, including the Great Pacific Garbage Patch.

It took 13 years to achieve Solar Impulse's historic journey, but now the group is moving on to other projects such as establishing the International Committee of Clean Technology (ICCT). Piccard and Borschberg created the ICCT to "continue the legacy Solar Impulse started, promoting concrete energy efficient solutions in order to solve many of the challenges facing society today."

Already 400 organizations have joined forces to help the ICCT achieve its goals. Notable patrons include H.S.H. Prince Albert II of Monaco, Richard Branson and Kofi Annan, who have already dedicated their work to the environment and clean energy sources. Patrons will advise governments and corporations on how to use clean technology.

"The International Committee of Clean Technologies is a fantastic opportunity to bring together a group of experts, with diverse experiences and backgrounds, to speak in one voice and leverage the efforts needed to bring change and influence global decision makers in the areas of clean technologies and renewable energy," Borschberg said.

Solar Impulse successfully lands in Abu Dhabi with Bertrand Piccard at the controls.Photo credit: Solar Impulse, Flickr

On July 11, Borschberg also predicted the world will soon see solar drones in the stratosphere, inspired by Solar Impulse's achievements.

"Solar Impulse is of course very well positioned to contribute to the next generation of unmanned solar airplanes," he said. "When considering technological progress today, these unmanned aircrafts will be able to fly much higher than they can today, avoiding air traffic and bad weather. They will be able to fly in extremely low air density and remain in the air both day and night, essentially taking over the need for satellites in a cheaper and more sustainable way. Parallel to SpaceX and Blue Origin, they could be brought down from the stratosphere to perform repairs and upgrades."

Borschberg mentioned that Solar Impulse may take flight again in different parts of the world to spread its message about clean technology.

The Solar Impulse team in Abu Dhabi after a successful landing, ending an historic trip around the world.Photo credit: Solar Impulse, Flickr

But for now, the pilots can revel in their completion of an historic trip around the world.

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Solar Impulse 2, a solar-powered plane that made a historic 90-hour journey across the Atlantic from New York to Seville in June, is now making its way to Cairo.

After the plane's stop in Cairo, it will make its way back to Abu Dhabi to complete its trip around the world. André Borschberg is piloting this leg of the flight, which took off from Seville at 4:20 a.m. local time (11:30 p.m. on July 10 EDT).

Shortly after takeoff, Borschberg and Solar Impulse 2 flew over the Gemasolar Thermosolar Plant, a joint venture between Masdar and Sener.

The 20-megawatt plant is the world's first utility-scale solar power plant to produce reliable energy for 24 hours a day. The plant, Masdar said, contains molten salt storage technology enabling it to generate electricity for 15 hours without solar irradiance electricity.

"A key misconception about solar energy is that it is only viable during daylight hours," Masdar CEO Mohamed Jameel Al Ramahi said. "Yet we have just witnessed a solar-powered aircraft capable of flying day and night soar directly over the first plant of its kind to produce reliable electricity day and night. This moment is a powerful symbol of the potential of solar energy and clean technologies to power a sustainable future, whether or not the sun is shining."

The Gemasolar Thermosolar Plant covers 185 hectares and generates 110 gigawatt hours per year. Energy produced by the plant is capable of powering 25,000 homes. The plant also offsets up to 30,000 tonnes of carbon emissions annually.

SolarReserve has a similar project in Tonopah, Nevada—Crescent Dunes. The solar plant produces energy for 75,000 homes even when the sun isn't shining.

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