Somewhere above Earth, natural radiation may be doing what spies cannot: probing satellites for hidden nuclear weapons.

She laid much of the theoretical groundwork for the atomic bomb, although she did not participate directly in its production. By Special to The New York Times This obituary was originally published on ...

Add Yahoo as a preferred source to see more of our stories on Google. (koto_feja/Getty Images) A breakthrough in chronometry decades in the making could redefine the limits of how we keep time. Using ...

Two teams of physicists have made the world's first nuclear clocks. These radical new devices keep time using fluctuations in the energy states of an atom's nucleus, rather than those of its electrons ...

In a chilling new book, theoretical physicist Carlo Rovelli says we’re back on the brink – and this time, leaders chronically lack the nous of Kennedy and Khrushchev. So why is he against rearming?

Every time you check the time on your phone, make an online transaction, or use a navigation app, you are depending on the precision of atomic clocks. Scientists are developing next-generation atomic ...

Nuclear isomers are crucial probes for studying the structure of nuclei. Unlike chemical isomers—which have the same chemical formula but different arrangements of atoms—nuclear isomers are nuclei ...

UC Santa Barbara physics professor David Weld is one of eight distinguished mid-career faculty selected for Caltech’s 2026 National Brown Investigator Awards. An atomic physicist who studies quantum ...

A clock built from thorium-229 has crossed an important line, from a long-discussed concept to a working device. The shift matters because this clock does more than keep time. It can also watch for ...

The Outer Space Treaty bans nuclear weapons in orbit—but we currently have no way to verify that satellites aren't carrying them.