Evidence of past explosions is revealed in the image - huge lobes of 20-million-degree Celsius gas (the red loops in the image at approximately the 2 o'clock and 7 o'clock positions) that extend over dozens of light-years on either side of the black hole.

BBC: Black hole 'on a diet'

Apart from the direct expenses in the clean up and compensation for those affected, the biggest costs could be greater federal and regulatory scrutiny at a time when the industry is collectively trying to project the image that oil and gas exploration is environmentally safe.

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Al Jazeera has always been regarded as something of a vanity venture by the wealthy emir of Qatar, which is home to the world's third largest gas reserve and is spending billions of dollars on its public image profile by sponsoring sports events at home and in Europe, experts said.

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