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  1. en.wikipedia.org › wiki › Age_of_EarthAge of Earth - Wikipedia

    The age of Earth is estimated to be 4.54 ± 0.05 billion years (4.54 × 10 9 years ± 1%). This age may represent the age of Earth's accretion, or core formation, or of the material from which Earth formed.

  2. Oct 19, 2023 · Learn how radiometric dating, isotopes, and half-life help scientists estimate the age of Earth to be 4.5 billion years. Find out the challenges and limitations of this method and the evidence from other sources.

  3. In numerical terms, the best estimate of Earth’s age so far is that it is close to 4.6 billion years old. But what does that mean exactly? If one uses a human lifetime of 75 years as a measure, the time between Earth’s formation and today has taken more than 61 million human lifetimes!

    • John P. Rafferty
  4. Jul 8, 2023 · Scientists estimate the age of the Earth is approximately 4.54 billion years, plus or minus 50 million years. This estimate is for the age of the Earth’s accretion into a planet with a core and spherical shape.

  5. May 16, 2014 · The Earth is at least 4.374 billion years old, based on the ratio of carbon-14 and carbon-12 in a zircon rock from Australia. Scientists use various techniques of radiometric dating to measure the age of other rocks and elements on the planet.

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  7. Jun 3, 2021 · Scientists use radiometric dating to measure the decay of radioactive elements in rocks and meteorites. They also compare the ages of Earth, moon and early solar system materials to estimate the formation of our planet.