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An international team led by Chinese scientists has discovered the biggest atomic cloud in the universe – a surprising finding that could help researchers better understand the origins of galaxies. The cloud, made up of hydrogen atoms, measures about two million light-years across and is 20 times larger than our Milky Way galaxy, according to a paper published in Nature. Astronomers from China, Europe and the United States found the cloud after they pointed the Five-hundred-meter Aperture Spherical radio Telescope (FAST) – the world's largest single-dish radio telescope – in the direction of a group of galaxies known as Stephan's Quintet.