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30-Jan-2020 18:09

He calculated the amount of time it would have taken for tidal friction to give Earth its current 24-hour day.His value of 56 million years added additional evidence that Thomson was on the right track.Even more constraining were Kelvin's estimates of the age of the Sun, which were based on estimates of its thermal output and a theory that the Sun obtains its energy from gravitational collapse; Kelvin estimated that the Sun is about 20 million years old.Geologists such as Charles Lyell had trouble accepting such a short age for Earth.

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The discovery of radioactivity introduced another factor in the calculation.Thus the age of the oldest terrestrial rock gives a minimum for the age of Earth, assuming that no rock has been intact for longer than the Earth itself.In 1892, Thomson had been made Lord Kelvin in appreciation of his many scientific accomplishments.giving a lower limit for the age of the Solar System.

It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites.Because the time this accretion process took is not yet known, and predictions from different accretion models range from a few million up to about 100 million years, the difference between the age of Earth and of the oldest rocks is difficult to determine.



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