Detection of Pristine Gas Two Billion Years After the Big Bang

@article{Fumagalli2011DetectionOP,
  title={Detection of Pristine Gas Two Billion Years After the Big Bang},
  author={Michele Fumagalli and John M. O’Meara and Jason Xavier Prochaska},
  journal={Science},
  year={2011},
  volume={334},
  pages={1245 - 1249}
}
Two cosmic clouds have been observed with a composition close to that of the universe before the first stars were formed. In the current cosmological model, only the three lightest elements were created in the first few minutes after the Big Bang; all other elements were produced later in stars. To date, however, heavy elements have been observed in all astrophysical environments. We report the detection of two gas clouds with no discernible elements heavier than hydrogen. These systems exhibit… 
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