Throughout the many adventures of Star Trek, it's extremely rare that the Enterprise (or any other ship) leaves the Milky Way galaxy. But why is that? We may receive a commission on purchases made from links. Welcome to Trekspertise, a series where we break down the technology, history, details, and decisions that make the Star Trek universe so complex — and so fun. Space is big. How big? So big, i... [8697 chars]