Story perspectives
New Study Challenges Mercury's Formation: Grazing Collision Theory
10/1/2025
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Story summary
- A study suggests Mercury formed from a grazing collision between two similarly sized bodies, challenging the giant-impact theory.
- Simulations show this scenario could explain Mercury's large core to mantle ratio and volatiles.
- The grazing impact could eject debris, prevent reaccretion, and influence Venus's formation.
- MESSENGER data reveal Mercury's large iron core and volatile elements; BepiColombo will seek data to confirm.
