The US space agency (Nasa) has launched a prototype rocket designed to replace the ageing space shuttle. The Ares I-X blasted off from Florida on a flight that will test technology for the development of a future manned launch vehicle. The 100m-tall, syringe-like rocket roared into the sky at 1530 GMT from Nasa's Kennedy Space Center. The stick-thin launcher is the first Nasa has built in more tha

