How far is the nearest black hole to earth and does it pose a threat?
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These can be just a dozen or so miles across, with one of the closest to us being Cygnus X-1 about 6,000 light-years away measuring 44 kilometres (27 miles) in diameter. If a black hole like Cygnus X-1 were to stray near the Solar System, within a light-year or so, its gravity would cause chaos.
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