Black holes are one of the most destructive forces in the universe, capable of tearing a planet apart and swallowing an entire star.<br /><br />Yet scientists now believe they could hold the key to answering the ultimate question -- what was there before the Big Bang?<br /><br />The trouble is that researching them is next to impossible. Black holes are by definition invisible and there's no scientific theory able to explain them.<br /><br />Despite these obvious obstacles, Horizon meets the astronomers attempting to image a black hole for the very first time and the theoretical physicists getting ever closer to unlocking their mysteries.<br /><br />It's a story that takes us into the heart of a black hole and to the very edge of what we think we know about the universe
