Earth and Other Terrestrial Planets Formed from Inner Solar System Material, Study Suggests planetaryscience space science
They formed either by collisions among planetary embryos from the inner Solar System or by accreting sunward-drifting tiny ‘pebbles’ from the outer Solar System. New research shows that the isotopic compositions of Earth and Mars are governed by two-component mixing among inner solar system materials, including material from the innermost disk unsampled by meteorites, whereas the contribution of outer solar system material is limited to a few percent by mass.
Determining which of the two processes governed the formation of the terrestrial planets of our Solar System is crucial for understanding the Solar System’s architecture and dynamical evolution, and for placing planet formation in the Solar System into the context of general planet formation processes, such as those observed in exoplanetary systems.
These isotope anomalies permit distinguishing between non-carbonaceous and carbonaceous meteorites, which are commonly assumed to represent planetary bodies that accreted in the inner and outer Solar System, respectively.
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