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Why does Earth have fewer visible impact craters than the Moon?
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Moon
(Left) Near side of Earth's Moon, photographed by the Galileo spacecraft on its way to Jupiter. (Right) Far side of the Moon with some of the near side visible (upper right), photographed by the Apollo 16 spacecraft.
Earth has fewer visible impact craters than the Moon primarily because Earth is a geologically and meteorologically active planet, whereas the Moon is geologically quiet and lacks an atmosphere.12
While it is a common misconception that Earth’s atmosphere shields the surface from all impacts, the atmosphere only prevents smaller objects from reaching the ground; larger, crater-forming objects are not significantly slowed by it. Instead, the primary reasons for the disparity include:1
- Geologic Activity: Earth’s surface is constantly reshaped by plate tectonics and volcanism, which can destroy or severely degrade older impact structures over time.1
- Erosion: Earth experiences active weather patterns, including wind and rain, which cause erosion. This process, along with the growth of vegetation and events like landslides, effectively erases or obscures craters that might otherwise remain visible.2
- Lunar Stability: In contrast, the Moon lacks an atmosphere and significant geologic activity, allowing its hundreds of thousands of craters to remain preserved and easily visible for billions of years.2