A commercial centre in Huntsville, Alabama, that claims to have the greatest collection of rocket and space memorabilia in the world. It includes a space museum and simulators, and visitors can experience a force of 3 g in a g-force accelerator and sit in an Apollo command module. The centre also has the non-profit Space Camp with programmes for young people and adults, including a simulated shuttle mission. Another part of the centre is the Aviation Challenge offering fighter-pilot experience by means of simulators.