The new research found that X-rays are being emitted as a regular signal from the super-massive black hole. The frequency of the pulse is related to the size of the black hole. This Hubble Space Telescope image, taken December 29, 2005 and released on October 2, 2007 shows giant star-forming nebula with massive young stellar clusters. Astronomers who stumbled upon a powerful burst of radio waves said that they had never seen anything like it before, and it could offer a new way to search for colliding stars or dying black holes. [Agencies]