SPH simulations indicate a Ceres-sized late veneer impact on Mars fragments ~50% of the impactor core into sub-mm metal hail, enabling HSE delivery to the mantle and transient ~3 bar H2 greenhouse lasting <3 Myr (or >10 Myr for slow-rotating Sun).
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Mars in the aftermath of a colossal impact
SPH simulations indicate a Ceres-sized late veneer impact on Mars fragments ~50% of the impactor core into sub-mm metal hail, enabling HSE delivery to the mantle and transient ~3 bar H2 greenhouse lasting <3 Myr (or >10 Myr for slow-rotating Sun).