In China, air tests of a mysterious aircraft named Caihong-T4 (CH-T4), which is powered by sunlight, took place. The machine has a wingspan of 40 meters and is lined with solar panels.
Despite its enormous dimensions, the unmanned aerial vehicle is capable of flying up to 20 kilometers and accelerating to 200 km / h.
Engineers from the Center have stated that solar panels and batteries installed on board allow it to float in the air for months or even years.