title: Extraterrestrial life: life on Mars--then and now.
abstract: The recent claim to have discovered evidence of extraterrestrial life on a meteorite from Mars is not compelling, but the study nevertheless has useful heuristic value.
authors.affiliation: Scripps Institution of Oceanography, University of California, San Diego, La Jolla 92093-0220, USA.
authors.forename: G
authors.initials: G
authors.lastname: Arrhenius
authors.forename: S
authors.initials: S
authors.lastname: Mojzsis
mesh_terms: D018559:Exobiology; D005580:Fossils; D018535:Mars; D019110:Meteoroids