While previously, researchers were not sure as to what was producing these unknown cosmic rays, a group of scientists believe they finally found out the culprit behind them. "These results represent the first indications of where the Milky Way's highest energy cosmic rays could come from," says Associate Professor Gavin Rowell, from the University of Adelaide's High Energy Astrophysics Group and leader of Australia's participation in the HESS Collaboration. "The most plausible 'engine' for this cosmic ray acceleration is the super-massive black hole right at the heart of our galaxy." According to a group of researchers, a number of 'alien' rays from outer space are hitting our planet. The group of researchers believes that the enigmatic rays are coming from a super-massive black hole which is located at the center of our galaxy. The supermassive black hole is believed to have the size of 4-5 million suns according to reports from German and Australian scientists. The supermassive black