NASA's next generation of spacecraft will have the safest-ever astronaut escape system, a modern-day version of the reliable Apollo system. Like Apollo, the Orion launch abort system will swiftly propel the crew capsule away from the nose of the Ares I rocket and out of harm's way in case of an emergency on the launch pad or during ascent to orbit. Also -- as was the practice at times during development of key Apollo elements -- while NASA engineers are working on the Orion launch abort system, another NASA team is investigating an alternate launch abort concept. The alternate system,...