thorium-229 — all stories

SCIENCE & TECH

Two teams build the first operating nuclear clocks

They do not yet match the best atomic clocks, but the technology could one day rival them and probe physics beyond the standard model.

Whitehall Minute
A blue laser beam crossing optics on a bench in a laboratory at JILA in Colorado, part of a strontium atomic clock photographed in 2017 (not one of the new nuclear clocks)