Photos: Solar Challenge--2,500 mile car 'rayce' Summary: Teams from the U.S. and Canada will step on the sun for a "rayce" of solar-powered cars from Austin to Calgary. By Bill Detwiler | July 19, 2006 -- 11:37 GMT (04:37 PDT) Follow @billdetwiler Previous | Next Image 10 of 12 Solar panels in place The final solar panels are placed on the top of Purdue University's SPOT 2. Topic: CXO Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.