If the venerable television series "Star Trek" has taught us one thing, it's that the holodeck will never work properly and you should never go in there. If it's taught us two things, the second must be that space is the final frontier. Even when we've managed to learn everything there is to know about Earth, there will still be mysteries to explore in space. We're only in the earliest stages of exploration. The Voyager 1, a spacecraft designed to study the outer planets in our solar system, entered interstellar space in September 2013. Who knows what questions it will answer as it continues its journey between the stars?