What is a Black Hole? A black hole is a region of space where the force of gravity is so extreme, everything – including light – cannot escape its pull. There are millions of ‘stellar’ black holes in the universe, formed by the collapse of giant stars. ‘Supermassive’ black holes, are far bigger, and are found at the centre of almost every galaxy.  We do not yet know how they form, however Albert Einstein predicted the existence of black holes in his theory of General Relativity over one hundred years ago. Einstein stated that objects with a massive gravitational force, [...]