(koto_feja/Getty Images) A breakthrough in chronometry decades in the making could redefine the limits of how we keep time.

Time feels familiar. It marks every moment of daily life, from the ticking of a wall clock to the changing numbers on a ...

(THE CONVERSATION) Most clocks, from wristwatches to the systems that run GPS and the internet, work by tracking regular, repeating motions. To build a clock, you need something that ticks in a ...

A clock built from thorium-229 has crossed an important line, from a long-discussed concept to a working device. The shift ...

Atomic clocks are established as the most precise timekeepers created. Atomic clocks work by deploying lasers to measure the vibrations of atoms (electromagnetic signals). By atoms oscillating at a ...

But physicists have long dreamt of even better clocks that run on atomic nuclei, which are less sensitive to environmental ...

Two independent research teams have achieved a longstanding goal in physics: building a working nuclear clock. The devices, ...

Most clocks, from wristwatches to the systems that run GPS and the internet, work by tracking regular, repeating motions. To build a clock, you need something that ticks in a perfectly repeatable way.