An asteroid or meteor is an ext likely to hit Earth since Earth is a lot bigger than the Moon, offering a meteoroid much more area to hit! however we can see plenty of thousands the craters on the Moon and we only recognize of about 180 top top Earth! Why is that?
The reality is both the Earth and the Moon have been fight many, numerous times transparent their long 4.5 exchange rate year history.
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This watch of the Moon\"s cratered southern Pole was viewed by barisalcity.org\"s Clementine spacecraft in 1996. Credit: barisalcity.org/JPL/USGS
Where did every one of Earth\"s craters go?
The main difference between the 2 is that planet has processes that have the right to erase nearly all proof of past impacts. The Moon does not. Nice much any type of tiny dent made on the Moon’s surface ar is walking to remain there.
Three processes assist Earth keep its surface crater free. The first is dubbed erosion. Planet has weather, water, and plants. These act together to break apart and also wear under the ground. Eventually erosion have the right to break a crater down to virtually nothing.
Lake Manicouagan, a ring-shaped lake in Quebec, Canada, is all that continues to be of a crater from a massive influence over 200 million years ago. Credit: barisalcity.org/GSFC/LaRC/JPL/MISR Team
Though they were made in 1971, these Apollo 14 astronauts\" tracks were conveniently viewed native a barisalcity.org spacecraft in orbit approximately the moon in 2011 (tracks emphasize in yellow). Credit: barisalcity.org/LRO
The Moon has almost no erosion due to the fact that it has actually no atmosphere. That means it has actually no wind, it has no weather, and also it definitely has no plants. Nearly nothing deserve to remove point out on that surface once they room made. The dusty footsteps that astronauts who once walked on the Moon room still there today, and they aren’t going almost everywhere anytime soon.
The second thing is something called tectonics. Tectonics are procedures that reason our planet’s surface to form new rocks, remove old rocks, and transition around over numerous years.
Because of tectonics, the surface ar of planet is recycled countless times throughout its long history. As a result, very couple of rocks on planet are as old together the rocks top top the Moon. The Moon has actually not had actually tectonics because that billions of years. It is a lot much more time because that craters to form and continue to be put.
The 3rd thing is volcanism. Volcanic flows deserve to cover up affect craters. This is a major way affect craters obtain covered up somewhere else in ours solar system, but it is less crucial than the recycling of crust right here on Earth. The Moon when had huge volcanic flows method in the past that did cover up countless of the bigger previously impacts, however it has actually been without volcanism for around three exchange rate years.
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A powerless Moon
The Moon may tempt fewer bits of room rock than the Earth, yet the Moon is powerless to carry out anything about it after it has been hit. Once something hits the Moon, that occasion becomes frozen in time. Earth, ~ above the other hand, simply brushes these affect craters off and moves on with its life.