They found not all wavelengths of UV radiation are equally damaging. Their model also shows that as atmospheres thin and ozone levels decrease, more high-energy UV radiation reaches the ground. If you're judging habitability, it's therefore important to think about ozone levels, not just radiation levels. Proxima-b, TRAPPIST-1e, Ross-128b, and LHS-1140b all orbit small red dwarf stars that often flare and spew high-energy UV radiation at their planets. "Our closest neighboring worlds remain intriguing targets for the search for life beyond our solar system."

Source: Forbes April 11, 2019 07:00 UTC