Generating an image of a black hole is a paradox. A black hole is invisible by nature – it emits no matter that we can measure. So what we see in the image is actually its event horizon. The bright ring is not a physical ring – it’s light coming from matter orbiting the black hole, which is so extremely warped that light itself is bending. There are black holes at the centre of every galaxy – some which sing, some which whir along quietly – and now that we’ve created images of one, it’s possible that we can continue to image more black holes, and even other kinds of cosmic matter.