Stars containing higher levels of heavier elements may have orbiting planets that are less hospitable to life, researchers have found.
. O3 absorbs the energy from longer wavelength UV-B light, splitting into O2 and lone O ions. O2 oxygen also absorbs some UV, splitting into two O ions after interacting with mainly shorter wavelength UV-C.
A diagram by the researchers showing how the metallicity of stars may impact ozone formation, and therefore the existence of life, on orbiting planets.The scientists found that while stars richer in heavy elements like metals produced less UV light, those that were metal-poor allowed for the formation of an ozone layer, and were therefore more ideal for the formation of life, due to less UV actually reaching the surface of the planet.
UV light is bad news for life, as it ionizes molecules. If those molecules are DNA or other genetic code, atoms being ionized, which may lead to cancers in multicell organisms like humans, or merely kill a single-celled organism.
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