“The optical clock community is strongly motivated to obtain the best possible set of measurements before the SI second is ...

Rubidium holdover clocks must be designed to operate autonomously for months or years without human intervention. However, its long-term stability is affected by component ageing and environmental ...

A NASA satellite that’s been orbiting as space junk since 1967, Relay 2, emitted an unexpected, powerful radio burst that ...

IAEA chief Rafael Grossi said US strikes caused damage to Iran's nuclear sites. Centrifuges were vulnerable. He denied the ...

The NPT-based nonproliferation regime has often worked best by giving countries time and incentives to reconsider fateful ...