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What are black holes, how do we know they are there and why do they matter? Well all those questions could become much clearer - and soon - as scientists in the US are creating a telescope powerful enough to bring us the first ever pictures of a black hole. Our Science reporter, Jonathan Amos, is in Boston, where an extraordinary effort is underway to link twelve most powerful radio telescopes around the world, creating one virtual mega-telescope. Photo: The Aperture Spherical Telescope in Guizhou province, China. Credit: AP