title: Atmospheric science: Ancient air caught by shooting stars.
authors.affiliation: Space Science Division, NASA Ames Research Centre, Moffett Field, California 94035-1000, USA.
authors.forename: Kevin
authors.initials: K
authors.lastname: Zahnle
authors.affiliation: Department of Earth &Space Sciences, and in the Astrobiology Program, University of Washington, Seattle, Washington 98195-1310, USA.
authors.forename: Roger
authors.initials: R
authors.lastname: Buick