The curious minds at What If explore whether humans could ever travel faster than the speed of light, investigating physics, relativity, and theoretical possibilities.

A spacecraft traveling at 99 percent the speed of light toward Alpha Centauri would cross 4.3 light-years in what feels like months to its crew, while decades tick by on Earth. That asymmetry is not ...

In late 2020, physicist Harold “Sonny” White, PhD, research director of the nonprofit Limitless Space Institute, noticed something peculiar—and familiar—in a circular pattern of data plots generated ...

(Hans Strand/Corbis Documentary/Getty Images) Some truths about the Universe seem absolute. Entropy flows one way. Gravity sucks. And nothing can outrun the speed of light. But a quirk of how sound ...

Add Yahoo as a preferred source to see more of our stories on Google. Light can travel billions of years yet experience no time. Here's how Einstein's physics explains it. (CREDIT: Shutterstock) A ...