In 1862, the physicist William Thomson, 1st Baron Kelvin published calculations that fixed the age of Earth at between 20 million and 400 million years.

## Who first dated the earth?

In 1913, geologist Arthur Holmes published “the Age of the Earth,” the first major effort to date the planet using radiometric dating. “It is perhaps a little indelicate to ask of our Mother Earth her age,” he wrote in his introduction — then proceeded to reveal that she was roughly 1.6 billion years old.

## What is the order of age of Earth?

Age of earth is of the order is 1017s.

## How did scientists determine the age of the Earth?

The age of rocks is determined by radiometric dating, which looks at the proportion of two different isotopes in a sample. Radioactive isotopes break down in a predictable amount of time, enabling geologists to determine the age of a sample using equipment like this thermal ionization mass spectrometer.