News Space Exoplanet oxygen may not signal alien life Water and ultraviolet light could create the gas without help from organisms Share this:FacebookTwitterPocketRedditPrint By Christopher Crockett March 18, 2014 at 11:24 am This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe