A spaceship to travel the galaxy! What will it need? What dangers will the crew face? What fuels will we use? Let's roughly throw together a spaceship. Ok, first order of business: propulsion. What's the best bet for fast and efficient propulsion? I like the nuclear propulsion and ion propulsion ideas best...but what about antimatter propulsion? Life support? Protection from radiation? Artificial gravity? Artificial habitats on board? Self-sustainability? What will we need? What will we do?