Survey identifies more than 156,000 extragalactic sources, offering an unprecedented pool for studying the universe’s biggest questions.

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 this week. It contains 156,411 extragalactic sources – nearly five times the number detected by the…

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