We as a race only left our own planet for the first time a mere 52 years ago. Even as we explore further than we've previously been, there is still a vast amount of unknown that exists around us in outer space. With that comes plenty of mysteries, including one that has kept our eyes to the skies for some time now: Unidentified flying objects (UFOs). Our curiosity makes us wonder if we're alone, and UFOs may provide an answer. Such sightings are tracked by amateurs and professionals alike, and whether you're already a true believer or still a skeptic, you can join their ranks with the help of the eight apps we've gathered for UFO spotting.