A Martian meteorite suggests the Red Planet and Earth weren't created at the same speed.
A one-of-a-kind meteorite from Mars has an unexpected chemistry that could refine scientists’ models of how terrestrial planets form, according to a new study of the old space rock.
Those gasses weren’t just any chemicals. They were volatiles, chemical elements and compounds that vaporize very easily. Volatiles include hydrogen, carbon, oxygen, and nitrogen, as well as noble gasses, which are inert elements that don’t react with their environment. On Earth, those chemicals eventually allowed our world to develop and support life., a postdoctoral fellow in the Institute of Geochemistry and Petrology at ETH Zürich compared two Martian sources of the noble gas krypton.
If the atmosphere was delivered by space rock, planetary scientists would expect the volatiles in a planet’s atmosphere to match those from chondritic meteorites, not the solar nebula. Instead, Péron found that the krypton from the Martian interior is nearly purely chondritic, while the atmosphere is solar.
Scientists often look to Mars to study the early solar system precisely because of how fast it is thought to have formed. Mars, which is a tenth of the size of Earth, is also far less geologically active, which means the Red Planet probably preserves a lot of the conditions of our planetary neighborhood’s earliest days.
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