Solar cars roll across Earth's driest desert

Solar cars roll across Earth's driest desert
In this photo released by Carrera Solar Atacama 2012, a driver sits in his solar powered car from the team BozzEnergy at the start of the first phase of a race, in Humberstone in the area of Pozo Almonte, Chile, Thursday, Nov. 15, 2012.
SANTIAGO, Chile (AP) — The second annual Solar Challenge has begun in Chile's Atacama desert, where 15 solar-powered cars rolled out of an old salt mine Thursday.

The solar-powered prototypes will travel more than 800 miles (1,300 kilometers) through the world's driest desert in the four-day, multinational race.

There are two categories: cars powered only by solar energy, and three-wheeled models that get a little help from pedals pushed by the drivers themselves.

The cars had to be built for less than $7,000, forcing their makers to be creative more than wealthy. Most of the teams represent university engineering departments.

The big finish comes Monday, and the winners get prizes of $30,000 in the solar category and $9,000 in the hybrid category.