Henry Spencer : (3)

" Spaceflight, especially in the Mercury spacecraft, clearly wasn’t going to be much like flying an airplane. " - Henry Spencer

" On the technical side, Apollo 8 was mainly a test flight for the Saturn V and the Apollo spacecraft. The main spacecraft system that needed testing on a real lunar flight was the onboard navigation system. " - Henry Spencer

" The Orion capsule uses an escape system quite like that of the Apollo spacecraft in the 1960s and 70s: an ‘escape tower’ containing a solid-fuel rocket that will pull it up and away from Ares I in a pinch. " - Henry Spencer