Einstein had some pretty crazy theories about time, and two scientists set out to test them by taking a long flight on a commercial airliner.

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A photon can cross a billion light-years while accumulating no elapsed time along its path. Special relativity links space ...

On September 14, 2015, two enormous laser instruments in the United States twitched in near-perfect unison, registering a ...

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 ...

The most vexing question in physics right now is how general relativity – the laws that govern gravity and space-time on large scales – meshes with quantum mechanics, the laws that govern very small ...

Intelsat signed an agreement for multiple launches of Relativity Space's Terran R rocket starting as soon as 2026. Credit: Relativity Space WASHINGTON — Satellite operator Intelsat has signed an ...

Thanks to Albert Einstein, the US Government wants to establish an official time zone for the Moon. It has less to do with jet lag and more to do with how gravity affects time and can throw a lot of ...

The Relativity Space expansion includes a new production facility for the two-stage Terran R rocket. This expansion, previously code-named Project Forge, was approved for up to $350 million in conduit ...

In the gloomy days of January, time seems to drag. According to the Einstein theory of relativity, it actually does—in a minute amount that means little to anyone except a scientist. During its annual ...