When electrons and positrons collide, you've got antimatter. Previously, astrophysicists believed that this particle slam-dance could only happen in the hot, energetic heart of a galaxy. But now a new article in the latest issue of Nature reveals that antimatter is being brewed up everywhere around us — at least, everywhere with a binary star system with a black hole, or a neutron star. That means antimatter is raining down on Earth from our own little volume of space, and future antimatter miners won't have to travel to the center of the galaxy to get this potential form of fuel. [Nature]