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When did the world begin?

When did the world begin?
Paige barker from Cheshire (Age 5-14)

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2 Responses

  1. The most popular estimate, based on the rate of radioactive decay of certain heavy atoms in meteorites, is that the Solar System (including the Earth) formed about 4,540 million years ago.

    For more information see http://pubs.usgs.gov/gip/geotime/age.html or http://en.wikipedia.org/wiki/Age_of_the_Earth

  2. Its bonkers, but we know this one really accurately. Meteorites were the first rocks to form in the solar system, and we can analyse them in the lab and they give us a very consistent age of around 4566 million years. We think that planets formed pretty quickly – maybe within a million years – of these first rocks. So if you said the world began around 4560 million years ago, you wouldn’t be far wrong.

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