Much of the moon's surface is 200 million years older than previously estimated, a new analysis suggests.
Part of the moon's surface is much older than experts previously thought, with many of the craters pockmarking the iconic"man in the moon" predating that landform by hundreds of millions of years, new research finds.
One method, crater counting, involves simply tallying up the number of impacts on the lunar surface and estimating how long it would take to accrue all those scars; the moon lacks the erosion and plate tectonics that erase craters on Earth, so the surface stays relatively unchanged over millennia. But crater counting doesn't always correspond with the dating results that scientists get from directly studying the moon rocks returned by the crewed Apollo missions to the moon.
The researchers examined samples returned from the lunar surface by the Apollo, Luna and Chang'e missions, and then tallied the craters around the sites where these rocks were originally found in order to properly correlate the ages. Then, they generalized that information across the lunar surface to get better age estimates of areas where the only information comes from crater count, not rock samples.
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