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.