This image courtesy of the European Southern Observatory (ESO) shows an artist's impression of an active galaxy that has jets. The central engine is thought to be a supermassive black hole surrounded by an accretion disc and enshrouded in a thick doughnut-shaped structure of gas and dust, which astronomers call a "torus". The torus of dust and gas can be seen orbiting a flatter disc of swirling gas. In the center, the supermassive black hole is surrounded by a flat accretion disc of rapidly orbiting material. The jets are emitted at right angles from the plane of the disc.