title: Planetary science. Life or volcanic belching on Mars?
authors.forename: Richard A
authors.initials: RA
authors.lastname: Kerr
mesh_terms: D001419:Bacteria / Q000378:metabolism; D018559:Exobiology; D005118:Extraterrestrial Environment; D018535:Mars; D008697:Methane; D017550:Spectroscopy, Fourier Transform Infrared; D018707:Volcanic Eruptions
chemical_list: D008697:Methane