The new dating system doesn't change estimates of the moon's age as a whole, which remains around 4.53 billion years.
. These two dating methods have traditionally given different results, especially for the ages of the heavily cratered and mountainous highlands of the moon.
"We decided that we had to reconcile these differences, and that meant correlating individually dated Apollo samples to the number of craters in the sample site surrounding area — in effect, resetting the crater clock,' Centre for Planetary Habitability, University of Oslo, professor Stephanie Wernerat the Goldschmidt Geochemistry Conference in Lyon.
Like the moon, Earth also experienced a large number of impacts by space rocks during the turbulent early years of the solar system, but a similar crater-counting dating method wouldn't work on our planet. That's because geological processes like theThe moon, on the other hand, is fairly geologically inactive, and that means that rather than being eroded away, the record of the impacts it has experienced is frozen into the lunar surface.
"Looking at the signs of these impacts on the moon shows what Earth would be like without the geological churning of plate tectonics which took place here on Earth," Werner said."What we have done is to show that large portions of the lunar crust are around 200 million years older than had been thought."The team behind the findings explains that the new dating system doesn't changeas a whole, which remains around 4.53 billion years.
"This is an important difference. It allows us to push back in time an intense period of bombardment from space, which we now know took place before extensive volcanic activity that formed the 'Man in the moon' patterns — the mare volcanic plains, including Mare Imbrium," Werner said."As this happened on the moon, the Earth was almost certain to have also suffered this earlier bombardment too.
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