Using absorption lines in the spectra of two background quasars and deep ALMA observations in CO, our group discovered a cold gas stream in a massive dark matter halo. The stream is made of gas that is extremely poor in heavy elements. The detection signifies that massive starburst galaxies existed 11 billion years ago are likely fed by similar cold streams. In other words, we have discovered a major artery leading to the heart of a phenomenal galaxy during its adolescence.

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