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An undated illustration shows an artist's impression of a black hole engine. Black holes are the most fuel-efficient engines in the universe, researchers said on April 24, 2006. If a car could use this kind of engine, it could theoretically go about a billion miles (1.6 billion km) on a gallon (4.5 litres) of gas, said Steve Allen of Stanford University in California. Fueled by matter lured by the holes' vast gravity, most of the energy released by this matter as it gets close to the black hole's point of no return – known as the event horizon – shows up in the form of high-energy jets, which spew forth from magnetized disks of gas. (Photo by Reuters/NASA)
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