 In a similar way , xenon isotopic ratios such as 129Xe / 130Xe and 136Xe / 130Xe are also a powerful tool for understanding planetary differentiation and early outgassing . For example , The atmosphere of Mars shows a xenon abundance similar to that of Earth : 0 @.@ 08 parts per million , however Mars shows a higher proportion of 129Xe than the Earth or the Sun . As this isotope is generated by radioactive decay , the result may indicate that Mars lost most of its primordial atmosphere , possibly within the first 100 million years after the planet was formed . In another example , excess 129Xe found in carbon dioxide well gases from New Mexico was believed to be from the decay of mantle @-@ derived gases soon after Earth 's formation . 
 In a similar way , xenon <a href='uninflect' title='1'><mark>isotopic</mark></a> ratios such as 129Xe / 130Xe and 136Xe / 130Xe <a href='drop_aux' title='2'><mark>are</mark></a>also a powerful tool for understanding planetary differentiation and early outgassing . For example , The atmosphere of Mars <a href='uninflect' title='3'><mark>shows</mark></a> a xenon abundance similar to that of Earth : 0 @.@ 08 parts per million , however Mars <a href='uninflect' title='4'><mark>shows</mark></a> a higher proportion of 129Xe than the Earth or the Sun . As this isotope is generated by radioactive decay , the result may indicate that Mars lost most of its primordial atmosphere , possibly within the first 100 million years after the planet was formed . In another example , excess 129Xe found in carbon dioxide well gases from New Mexico was believed to be from the decay of mantle @-@ derived gases soon after Earth <a href='null_genetive' title='5'><mark>'s</mark></a>formation . 
In a similar way , xenon isotopiced ratios such as 129Xe / 130Xe and 136Xe / 130Xe also a powerful tool for understanding planetary differentiation and early outgassing . For example , The atmosphere of Mars show a xenon abundance similar to dat of Earth : 0 @.@ 08 parts per million , however Mars show a higher proportion of 129Xe den da Earth or tdaSun . As this isotope is generated by radioactive decay , the result may indicate that Mars lost most of its primordial atmosphere , possibly within the first 100 million years after the planet was formed . In anotha example , excess 129Xe found in carbon dioxide well gases from New Mexico was believed to be from the decay of mantle @-@ derived gases soon after Earth  formation .