Geologists have calculated the age of Earth at 4.6 billion years. But for humans whose life span rarely reaches more than 100 years, how can we be so sure of that ancient date? It turns out the ...

Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years. Mountains have been built and eroded, continents and oceans have moved ...

Okay so I understand at a very basic level how radiometric dating works, but I have a question. How do scientists know the half-life of isotopes, when some of them are measured in millions or billions ...

Potassium-argon dating of igneous and metamorphic rocks with applications to the basin ranges of Arizona and Sonora / P.E. Damon -- A comparison of the isotopic mineral age variations and petrologic ...

Radiometric dating is an effective method for determining the age of the material, whether a mineral or a piece of organic tissue, by counting the amount of radiation that's embedded in the matter.

Modern radiometric dating of the Siloam Tunnel in Jerusalem shows that it was excavated about 700 years before the Common Era, and can thus be safely attributed to the Judean King Hezekiah. This is ...

Rice University professor Bidong Zhang has received a grant to develop next-generation lunar radiometric dating techniques that will acquire more accurate ages for lunar samples. This project is ...

Ars Technica has been separating the signal from the noise for over 25 years. With our unique combination of technical savvy and wide-ranging interest in the technological arts and sciences, Ars is ...