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Story summary
- A study by the Max Planck Institute for Solar System Research finds Theia originated in the inner Solar System, nearer the Sun than Earth.
- Researchers analyzed iron isotopes in 15 terrestrial rocks and six lunar samples.
- They found indistinguishable isotopic compositions between Earth and the Moon, supporting the Giant Impact Hypothesis that Theia and proto-Earth were neighbors.
- The study was published on November 20, 2025.
