The fastest stars in our galaxy are invaders

We're pretty familiar with our own Solar System, but the galaxy that we reside in is absolutely enormous. The Milky Way is thought to have somewhere between 100 billion and 400 billion stars, depending on which estimate you favor, and some of the most interesting ones are moving so fast that they stand out in a big way. But now, new research suggests that these incredibly fast-moving stars aren't actually from the Milky Way at all, but are actually invaders from a completely different system.&nb