Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Two cutting-edge atomic clocks — the most accurate ever ...

・A photon can cross a billion light-years while accumulating no elapsed time along its path. ・Special relativity links space and time, causing moving clocks to run more slowly as their speed increases ...

For over a century, physicists have grappled with one of the most profound questions in science: How do the rules of quantum mechanics, which govern the smallest particles, fit with the laws of ...

Every satellite in the Global Positioning System carries an atomic clock, and every one of those clocks is deliberately adjusted before launch so that it runs slightly slow. The reason is not a ...