text: The authors point out that this does not necessarily mean that such stars can’t support life. Stellar activity such as flares and coronal mass ejections can temporarily increase UV flux, possibly providing enough to make up for low steady-state flux. And oceans on planetary surfaces could shield potential life from UV flux that is too high.
  Nonetheless, the estimates of the UV habitable zone in this study help us to narrow down the most probable places for finding life in the universe.