This month, the Sky at Night team reveals how the first picture of a supermassive black hole was captured. When the photograph of the hole at the heart of the M87 galaxy was released in April, it captured the world's imagination and made headlines everywhere. Chris Lintott reports from behind the scenes, meeting the scientists from the Event Horizon Telescope who worked for a decade to capture the image. And Maggie Aderin-Pocock reveals the mysterious and terrifying power of this astonishing cosmic phenomenon.