Experimental plane Solar Impulse 2 is again back in the skies following a nine-month delay for repairs. Its last trip was dampened by overheating batteries, but it still managed to set a record for longest duration of a nonstop solo flight when going from Japan to Hawaii.
The vehicle is of course powered by solar. As planes are a major contributor to pollution, the mission here is to encourage clean energy. And there's no better way to do that than fly Solar Impulse 2 around the entire world, which is what's happening as you read this. You can watch the launch here and the journey live via the stream above.