Why do most all Sci-Fi shows involving space travel focus on one ship? To my knowledge, you would never see just one military ship sailing the seas; they are always accompanied by support ships and such. This seems to be a wise decision as you have safety in numbers. So why, in the sci-fi future, do humans send only one ship at a time alone into space to fend for itself? I understand that at the beginning of space travel, it is more cost effective to send just one, but even when humanity has hundreds or thousands of war vessels, they still seem content with separating them all into one ship teams. This question is primarily focused on war ships and the like. It's more understandable for civilian and cargo ships to go alone. But it is very, very rare for military vessels to be alone. So I was wondering if there was an actual scientific or militaristic explanation behind this or it was merely for story line purpose (it would make things more complicated following five ships instead of just one). Also, my knowledge of sci-fi shows is a bit limited so I may be wrong in this conclusion, but from what I've seen, this is definitely a pattern.