Radiometric dating of meteorites from another solar system

Kelvin stuck by his estimate of 100 million years, and later reduced it to about 20 million years.

The discovery of radioactivity introduced another factor in the calculation.

Kelvin calculated the age of the Earth by using thermal gradients, and he arrived at an estimate of about 100 million years.Studies of strata, the layering of rocks and earth, gave naturalists an appreciation that Earth may have been through many changes during its existence.These layers often contained fossilized remains of unknown creatures, leading some to interpret a progression of organisms from layer to layer.After Henri Becquerel's initial discovery in 1896, Marie and Pierre Curie discovered the radioactive elements polonium and radium in 1898; and in 1903, Pierre Curie and Albert Laborde announced that radium produces enough heat to melt its own weight in ice in less than an hour.Geologists quickly realized that this upset the assumptions underlying most calculations of the age of Earth.For biologists, even 100 million years seemed much too short to be plausible.

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