The rare gas laboratory activities CRPG (petrographic and geochemical Research Center), UMR 7358 CNRS-UL, concern in particular the extent of noble gases (He, Ne, Ar, Kr, Xe) and nitrogen in various terrestrial samples And extraterrestrials for geo and cosmochemical
Oxygen and nitrogen samples collected from various meteorites, as well as nitrogen sampled in lunar soil and in the Jupiter atmosphere by the Galileo probe, vary significantly from that on Earth by cosmochemical
standards: 38 percent for nitrogen and up to 7 percent for oxygen.
Since the discovery of the Earth's core about a century ago, the idea of iron being the dominant component of the core gained firm support from cosmochemical
and geochemical observations, seismic data, theory of geomagnetism, and high-pressure studies.