Dating of the earth

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How do scientists know how old an object or human remains are?

Scientists believe that about 4.3 billion years ago, water already existed on Earth's surface.Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.If you asked the same question of an educated European in AD 1900 you would have received a quite different answer.

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He would have answered that the Earth was ancient, that there had not been a Noachian flood, and that the species of life had not been fixed over the history of Earth.

She is the editor of the Journal of the Royal Astronomical Society of Canada and the author of several books.

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