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Published online 29 November 2001 | Nature | doi:10.1038/news011129-13

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Massive hole makes theories leaky

Surprising black hole weigh-in has astronomers scratching their heads.

Forty thousand light years away, on the other side of the Milky Way, lies object GRS1915+105. It is a giant star and a black hole orbiting one another, blasting out X-rays and ejecting gas and dust at close to the speed of light.

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