Dating meteorites age earth

At some point in the early history of Earth, a planetoid the size of Mars crashed into our planet.

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Various chemicals, and specifically radioactive isotopes were formed together.By measuring the amount of three different isotopes of lead (Pb-206, Pb-207, and Pb-208 or Pb-204), geologists can calculate how much Uranium was originally in a sample of material.If the Solar System formed from a common pool of matter, with uniformly distributed Pb isotopes, then all objects from that pool of matter should show similar amounts of the isotopes.How do scientists know Earth is 4.54 billion years old?

It’s actually difficult to tell from the surface of the planet alone, since plate tectonics constantly reshape its surface.Henri Becquerel discovered radioactivity, the process where materials decay into other materials, releasing energy.

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