Sara Mazrouei does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.
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.
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A simple analogy for the concept of thermal inertia is rocks and sand at the beach. During the day both large rocks and the sand are warm. However, as soon as the sun sets, the sand gets cold. The large rocks which have a higher thermal inertia, however, stay warm for longer.
The size and age distributions of lunar and terrestrial craters larger than 20 kilometres over the last 650 million years have similar shapes. This implies that large crater erasure must be limited on stable terrestrial terrains. It also implies that the observed deficit of large terrestrial craters between 290-650 million years is not preservation bias, but a reflection of a distinctly lower impact rate. If we had observed more dominant erosion, the age distribution of terrestrial craters would be strongly skewed toward younger ages.
Support for limited erosion on cratered terrains also comes from records of kimberlite pipes on Earth. Kimberlite pipes are carrot-shaped pipes that extend a couple of kilometres below the surface and are often located on the same stable regions where we would find preserved impact craters. These underground pipes have been widely mined for diamonds, providing scientists with plentiful information about their location and erosion state.
Records show that kimberlite pipes have not experienced much erosion since forming around 650 million years ago. Therefore, the large young impact craters found on the same stable terrains must also be intact, providing us with a complete record. 152ee80cbc
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