Comets, meteorites and atmospheres.
The relatively low value of Xe/Kr in the atmospheres of Earth and Mars seems to rule out meteorites as the major carriers of noble gases to the inner planets. Laboratory experiments on the trapping of gases in ice forming at low temperatures suggest that comets may be a better choice. It is then possible to develop a model for the origin of inner planet atmospheres based on volatiles delivered by comets added to volatiles originally trapped in planetary rocks. The model will be tested by results from the Galileo Entry Probe.
Owen
T
T
Institute for Astronomy, University of Hawaii, Honolulu 96822, USA.
Bar-Nun
A
A
D001128:Argon; D001272:Atmosphere / Q000032:analysis*; D018534:Earth, Planet; D005118:Extraterrestrial Environment; D007726:Krypton; D018535:Mars; D019110:Meteoroids; D009356:Neon; D005741:Noble Gases / Q000032:analysis*; D018536:Venus; D014978:Xenon
D005741:Noble Gases; D014978:Xenon; D009356:Neon; D007726:Krypton; D001128:Argon