"Consequently, many planets that have evolved organic life often have an ozone layer in the upper atmosphere that absorbs ultraviolet radiation and protects the organisms on the surface."

Should this be here when we've not confirmed that life exists beyond our own planet? 209.250.204.134 03:43, October 3, 2012 (UTC)

In Star Trek, they have. --OuroborosCobra ^talk 08:53, October 3, 2012 (UTC)