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    Dating craters

    Note that the age of these surfaces is not necessarily the age of the planet as a whole.On geologically active objects (including Earth), vast outpourings of molten rock or the erosive effects of water and ice, which we call planet weathering, have erased evidence of earlier epochs and present us with only a relatively young surface for investigation.Table 1 summarizes the decay reactions used most often to date lunar and terrestrial rocks.

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    If a world has a surface (as opposed to being mostly gas and liquid), astronomers have developed some techniques for estimating how long ago that surface solidified.Another way to trace the history of a solid world is to measure the age of individual rocks.After samples were brought back from the Moon by Apollo astronauts, the techniques that had been developed to date rocks on Earth were applied to rock samples from the Moon to establish a geological chronology for the Moon.One way to estimate the age of a surface is by counting the number of impact craters.This technique works because the rate at which impacts have occurred in the solar system has been roughly constant for several billion years.

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