Astronomers watch as a gas cloud gets torn to shreds by a black hole

Two years ago, astronomers realized that a gas cloud was on a collision course with the supermassive black hole at the center of our galaxy. The encounter has since taken place — and it was all recorded in real time. Here's how it all went down — and a stunning simulation to go along with it. » 7/18/13 12:20pm 7/18/13 12:20pm