See related story: NASCAR in the Clouds

An artist's rendering of a Mark 1 X-Racer graces a promotional poster.
Photo: Courtesy of Rocket Racing League
Rocket Racing League's prototype plane lines up for takeoff with test pilot Rick Searfoss at the controls.
Photo: Courtesy of Rocket Racing League
Rocket racers will zip through virtual racetracks in the sky.
Image: Courtesy of Advanced Micro Devices and Rocket Racing League
A computer simulation shows what a virtual racetrack might look like.
Image: Courtesy of Advanced Micro Devices and Rocket Racing League
The prototype rocket racer soars through the air.
Photo: Courtesy of Rocket Racing League