The 30th World Solar Challenge kicked off on Monday in Australia.
The biennial competition sees teams of students race vehicles designed to operate almost exclusively on solar power.
They are allowed 10 per cent of their energy to start off with, but after that, the vehicle has to rely completely on solar energy as they race the 3 000km between Darwin and Adelaide in Australia.
This year sees teams from more than 30 countries competing to show off their solar-powered cars.
Racers stop at 17:00 daily, and have to make camp in the desert wherever they happen to find themselves. Racing then resumes the next morning.