text: The study, published in the Astrophysical Journal, estimates that one per cent to 16 per cent of all Sun-like stars could be formed in such stellar nurseries.
  This setup differs from the supernova hypothesis in order to make sense of two isotopes that occur in strange proportions in the early solar system, compared to the rest of the galaxy.
  Meteorites left over from the early solar system tell us there was a lot of aluminium-26. In addition, studies, including a 2015 one by Dauphas and a former student, increasingly suggest we had less of the isotope iron-60.
  This brings scientists up short, because supernovae produce both isotopes. "It begs the question of why one was injected into the solar system and the other was not," said Vikram Dwarkadas, a research associate professor at University of Chicago.
  "The idea is that aluminum-26 flung from the Wolf-Rayet star is carried outwards on grains of dust formed around the star," said Dwarkadas.