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New Theory: Earth Formed Entirely From Inner Solar System
2 Apr
Summary
- Earth may have formed from nearly zero percent of outer solar system material.
- New analysis suggests Earth's composition matches inner solar system rocks.
- Jupiter's gravity likely acted as a barrier to outer solar system material.
Recent scientific analysis challenges the long-held belief that Earth incorporated significant material from the outer Solar System. New findings suggest that Earth's building blocks originated almost entirely from its local, inner Solar System environment, with potentially less than two percent coming from beyond Jupiter.
Planetary scientists Paolo Sossi and Dan Bower of ETH Zurich examined isotopic signatures in meteorites, finding that Earth's composition closely aligns with non-carbonaceous meteorites from the inner Solar System. This discovery implies a more orderly early Solar System with less material mixing than previously thought.
The presence of Jupiter is identified as a critical factor. Its immense gravity likely created a substantial barrier, preventing much material from the colder outer regions from migrating inward. This barrier may have been more effective than previously understood in segregating planetary materials.
These results raise new questions about how Earth acquired water and other volatile elements in a region initially thought to be too hot for them to survive. The study also notes that Mars and Vesta share similar compositions with Earth, suggesting a common formation pattern among inner planets.
