A group of physicists has stared at 12 atomic clocks located in the United Kingdom, France, the United States, Germany, and Italy from 1999 to 2014. Eight of these clocks are one of the most precise ...

The Deep Space Atomic Clock in the middle bay of the General Atomics Orbital Test Bed spacecraft. (Image: NASA) While in orbit, the Deep Space Atomic Clock (DSAC) mission will use the navigation ...

This is an introduction to the May 2023 Innovation article, “New type on the block: Generating high-precision orbits for GPS III satellites.” While I’m likely preaching to the choir here, GNSS cannot ...

SOME writers still contrast the static atom of Lewis and Langmuir with the dynamic atom of Bohr, as if the two alternatives were mutually exclusive. It does not seem to be realised generally that any ...