Most scientists believe the rate at which the moon and Earth have been bombarded by meteorites has remained constant for the past two to three billion years. Understanding the age of craters on the moon can help us better understand the age of our own planet because the Earth would have received similar numbers of impacts. It’s been assumed that the rarity of young craters on Earth (those created 300-600 million years ago) is attributed to preservation bias — craters have been erased over the years by erosion and the movement of the Earth’s plates. Since then however, using a…

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