Drivers from across the world are turning up the heat in a race across the Australian desert.
The cars look a bit like spaceships and that's not the only special thing about them.
They get their power from the SUN. Panels on the vehicles soak up the rays and turn them into energy to make the cars move.
Around 40 vehicles have entered the 2,000-mile race, which will take several days to complete.
When the sun goes down, the cars stop running - so the drivers will be camping out in the dust at night-time.
There will also be kangaroos and snakes to contend with.
No wonder one of the drivers admitted: "I'm a little nervous!"