By Will Dunham

WASHINGTON (Reuters) -Scientists are observing the most energetic flare ever seen emanating from a supermassive black hole, apparently caused when this celestial beast shredded and swallowed a huge star that strayed too close.

The researchers said the flare at its peak was 10 trillion times brighter than the sun. It was unleashed by a black hole roughly 300 million times the mass of the sun residing inside a faraway galaxy, about 11 billion light-years from Earth. A light-year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km).

Black holes are extraordinarily dense objects with gravitational pull so strong that not even light can escape. Most galaxies are thought to have one at their center. The black hole in this research is extremely massive –

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