Far-Side Moon Rocks Trace 3 Billion Years of Impacts, Undercutting 4-Billion-Year Bombardment Spike
Updated
Updated · SciTechDaily · Aug 2
Far-Side Moon Rocks Trace 3 Billion Years of Impacts, Undercutting 4-Billion-Year Bombardment Spike
1 articles · Updated · SciTechDaily · Aug 2
Summary
Far-side lunar samples dated to impacts from about 4.33 billion to 1.13 billion years ago point to a long decline in asteroid strikes, not a single violent surge early in Solar System history.
40Ar/39Ar analysis of Chang’e-6 impact melt rocks let researchers reconstruct more than 3 billion years of collisions from a part of the Moon largely missing from earlier laboratory studies.
That matters because most previous lunar evidence came from the near side, while the far side preserves a cleaner record less altered by later geological activity.
The findings challenge the late heavy bombardment hypothesis of a sharp impact spike roughly 4 billion years ago and could reshape models of how early Earth’s crust, habitability and life-friendly conditions developed.