If you've ever watched any of the Star Wars movies, then you've probably heard people talk about the Jedi and the Sith balancing each other out. Fantasy movies also talk about the precarious balance between good and evil. It's this basic idea of balance that has led scientists to believe in the existence of a mirror universe. by Joshua Hawkins via Yahoo news Some scientists say that our universe could just be one side of the coin. The other side is something they call the "anti-universe". It's basically a hypothetical mirror universe where time moves backward. But how exactly did scientists come to this conclusion? A new study on the matter focuses on the three most important symmetries that scientists have found in nature: charge, parity, and time. Charge basically dictates that if you flip the charge of a particle involved in an interaction to its opposite, then you'll get the exact same interaction. Parity then dictates that if you look at the mirror image of an interaction, you