autoevolution 5 Apr 2021, 14:11 UTC · by There probably isn’t a more complex process out there than putting together a spacecraft. No matter the task envisioned for it by Earth-based engineers, a spacecraft is one of the most complex pieces of machinery in exitence. And like most other machinery, they need to be tested very thoroughly. 1 photo The American space agency has one of the most rigorous such programs in existence. Take the Orion capsule that will head for the Moon with humans on board in a few years’ time. Not only is it subjected to hard testing on the ground, but it will also be sent empty to the Moon before actually carrying people there.