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The age of very old objects is often determined using radiometric dating techniques, which measure the decay of radioactive isotopes within the materials. For example, carbon-14 dating is commonly used for organic materials up to about 50,000 years old, while methods like uranium-lead or potassium-argon dating can date geological formations and ancient rocks that are millions to billions of years old. Scientists compare the ratio of parent isotopes to daughter products to estimate the time elapsed since the object was formed. Additionally, other methods such as dendrochronology (tree-ring dating) or stratigraphy can provide context and help corroborate age estimates.

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1mo ago

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