How do we know the age of the surfaces we see on planets and moons? 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. 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. 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. Thus, in the absence of forces to eliminate craters, the number of craters is simply proportional to the length of time the surface has been exposed. This technique has been applied successfully to many solid planets and moons Figure 1.

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To support our nonprofit science journalism, please make a tax-deductible gift today. Geochronologists have tried to pinpoint the age of the million-year-old Deccan Traps, massive lava flows in India that may have helped wipe out the dinosaurs. But for too long, the arbiters of these stories—the geochronologists who date the age of rocks—have been underfunded and uncoordinated.

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