• Made of essentially only hydrogen and helium, these so-called population III stars are predicted to be enormous in size and to live fast and die young.
  • Scientists thought population III stars probably resided in small dim primordial galaxies that astronomers would never see. But the team carried out a survey of galaxies shining brightly at ultraviolet wavelengths back as far as about 800 million years after the big bang, when the universe was about 6% its current age. They found an unexpected number of bright candidates.
  • A galaxy dubbed CR7 proved to be the brightest galaxy yet found in the early universe—three times as bright as the previous record-holder.

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