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Chamberlain (1899) pointed out that Kelvin’s calculations were only as good as the assumptions on which they were based.“The fascinating impressiveness of rigorous mathematical analyses, with its atmosphere of precision and elegance, should not blind us to the defects of the premises that condition the whole process.Of course, later scientists, like John Perry and T. After this came to light, Kelvin admitted that he might just as well have set his original upper limit on the age of the Earth at 4,000 Ma instead of 400 Ma.Of course, this was a close as Kelvin ever came to publicly recanting his position.Below is a list of the 1154 science fair project ideas on our site.To help you find a topic that can hold your interest, Science Buddies has also developed the Topic Selection Wizard.Based on these assumptions he at first suggested an age of the Earth of between 100 Ma and 500 Ma.

It was based on the idea that no significant source of novel heat energy was affecting the Earth.Although there were attempts to make relative age estimates, no direct dating method was available until the twentieth century.However, before this time some very popular indirect methods were available.His result was in close agreement with his estimate of the age of the earth.The solar estimate was based on the idea that the energy supply for the solar radioactive flux is gravitational contraction.