Planets that orbit binary stars seem to be common enough in our galaxy, and if they behave anything like Pluto’s binary system, they may not be all that pleasant to live on. According to NASA, if you lived on one of Pluto’s moons, you’d probably have a hard time figuring out when and where the sun would rise each day. But, then again, things may work differently at the larger scale of suns and planets. There's still hope that somewhere out there, on a planet with two suns, a young Luke Skywalker is learning to become a Jedi knight. He just might have a hard time figuring out what time it is.