Engineers have attached tiny new sensors to the shuttle's wings to detect potential damage. Twenty-two temperature sensors on each wing and 65 accelerometers, sensors that can monitor impact to the shuttle, will send readings -- taken 20,000 times per second -- to the crew compartment and to NASA's mission control in Houston.		Main: Return to Flight Making the Shuttle Fit to Fly Risks of Manned Spaceflight Next Generation Space Vessel Slide Show: Evolution of Spaceflight Interactive: Shuttle Upgrades Lesson Plan Archive