Table 1.

Argon Isotope Ratio (³⁶Ar/³⁸Ar) in the Atmosphere of Mars Compared to the Mars Meteorites, Sun, Jupiter, and Earth

Object	36Ar/38Ar Ratio
Mars atmosphere (MSL/SAM 2013)a	4.2 ± 0.1
Mars atmosphere (Viking/GCMS 1976)bc	4–7
Mars meteoritesd	3.5–4.6
Sunef	5.5 ± 0.01
Jupiterg	5.6 ± 0.25
Earthh	5.305 ± 0.008

^aThis paper.

^bBiemann et al. [1976].

^cOwen [1992].

^dBogard [1997].

^eVogel et al. [2011].

^fPepin et al. [2012].

^gMahaffy et al. [2000].

^hLee et al. [2006].