Astronomers have just discovered what may be the largest black hole known to date.

The giant black hole has a mass of 30 billion suns and sits at the center of a galaxy located hundreds of millions of light-years from Earth. Astronomers call the cosmic monster an ultramassive black hole, as opposed to the usual galactic supermassive black holes that weigh anywhere between a few million to a few billion solar masses. 

Astronomers discovered the black hole during observations of a galaxy located farther away from Earth than the one centered around the monster black hole, while using the gravity of the foreground galaxy to magnify the background object. This effect, known as gravitational lensing, is a result of gravity bending the light around extremely massive objects. Serving as nature's own telescope, gravitational lensing frequently helps astronomers to increase the magnification of objects too distant to be properly visible to human-made telescopes. 

The team arrived at the size of the black hole by analyzing the magnification of the foreground object in a series of images taken by the Hubble Space Telescope. Using sophisticated computer modeling, the scientists were able to simulate how much light bends around the foreground galaxy where the black hole resides. They tested thousands of black hole sizes before arriving at a solution that matched the observations. 

The black hole, located in one of the galaxies of the Abell 1201 galaxy cluster, is the first discovered using this technique. Although enormous, the black hole is not very active, meaning it's not swallowing too much material and therefore not producing strong X-ray radiation. Such black holes are nearly impossible to study by other methods. 

Source: www.space.com

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