The structure remains the third largest steerable telescope in the world and plays a key role in global research on pulsating stars, testing extreme physics theories including Einstein's general theory of relativity.

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Cosmologists investigating the structure of the universe do not really mind which direction a telescope is pointing, since the universe is isotropic and homogeneous which is a fancy way of saying that it looks the same in all directions.

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"It's correlating the increasing intensity in different bands that provides really important clues about the structure of the source, " Prof Madejski - a co-investigator on the NuStar X-ray telescope, told BBC News.

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