'Mars' fate was decided from the beginning.'
"Mars' fate was decided from the beginning," study co-author Kun Wang, an assistant professor of Earth and planetary sciences at Washington University in St. Louis,."There is likely a threshold on the size requirements of rocky planets to retain enough water to enable habitability and plate tectonics." That threshold is larger than Mars, the scientists believe., which they selected to be representative of the Red Planet's bulk composition.
Tian and her colleagues used potassium, known by the chemical symbol K, as a tracer for more"volatile" elements and compounds — stuff like water, which transitions to the gas phase at relatively low temperatures. They found that Mars lost significantly more volatiles during its formation than Earth, which is about nine times more massive than the Red Planet.
"The finding of the correlation of K isotopic compositions with planet gravity is a novel discovery with important quantitative implications for when and how the differentiated planets received and lost their volatiles," Lodders said., which was published online today in the journal Proceedings of the National Academies of Sciences, and previous work together suggest that small size is a double whammy for habitability.
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