China’s FAST telescope maps neutral hydrogen, the cosmic gas for making stars
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China’s FAST telescope has compiled the world’s largest catalogue of neutral hydrogen beyond the Milky Way, replacing a long-dominant US survey as the main reference for mapping the gas that fuels the formation of stars and galaxies. The FAST All-Sky H I Survey (FASHI), conducted with the 500-metre (1,640-foot) radio dish in southwest China’s Guizhou province, released its second batch of data thi
