It is easy to see why astronomers called this object the Eye of Sauron, after the all-seeing symbol of evil in The Lord Of The Rings. It is in fact the centre of an active galaxy 43 million light years away from Earth. Scientists believe powerful X-rays generated by a super-massive black hole produced the bright blue ‘pupil’ of the eye. Images from the Chandra X-ray space telescope and the one-metre Jacobus Kapteyn Telescope on La Palma in the Canary Islands were combined to create the stunning picture. The X-ray emissions from the centre of spiral galaxy NGC 4151 are thought to be caused by matter falling into the black hole. Black holes are regions where gravity is so strong nothing that gets too close can escape from it. More..