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Black hole engines

21/04/2006. Contributed by Jessica Martin

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One billion miles per gallon - that's how far a car could travel if it were powered by a typical black hole. Scientists with NASA's Chandra X-ray Observatory recently arrived at this estimate after determining black holes are the most fuel-efficient engines in the universe, a discovery that highlights a black hole's economical performance and its benefits.

"Just as with cars, it's critical to know the fuel efficiency of black holes," said Stanford University's Steve Allen, lead author of the study. "Without this information, we cannot figure out what is going on under the hood, so to speak, or what the engine can do."

Observations made with Chandra show that as matter falls toward a supermassive black hole, it releases enormous amounts of energy. The surprise revelation is that most of this energy goes into producing immense jets of particles that erupt from it at nearly the speed of light.

The jets were discovered when images from Chandra showed something was blowing giant bubbles into gas clouds surrounding black holes. Scientists were able to estimate the strength of the jets by determining the force and size needed to form such cavities. Their intensity shows researchers that black holes make mind-bogglingly good use of available resources.

"If a car was as fuel-efficient as these black holes, it could theoretically travel over a billion miles on a gallon of gas," said co-author Christopher Reynolds of the University of Maryland.

Engines, of course, perform work. In the case of black holes, the results of this study suggest the job of their jets is to possibly limit the numbers of stars that form near them.

Untold numbers of stars could condense from a black hole's hot gas clouds if the clouds are allowed to cool enough. The unbridled process could sprout billions of extra stars, perhaps crowding the cosmic neighborhood. The high-velocity jets stop this from happening by keeping cloud temperatures high and star formation in check.

More over at www.nasa.gov

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