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Astronomers have captured the first ever image of a colossal black hole, located in a distant galaxy 55 million light years from Earth.

The picture shows a halo of dust and gas, which traces the outline of the black hole at the heart of the M87 galaxy.

It measures 40 billion kilometres across - that's three million times the size of the Earth.

Speaking to Â鶹¹ÙÍøÊ×Ò³Èë¿Ú Radio 5 Live, Katie Bouman said the moment she first saw the image was "pure amazement".