The universe comes with a built‑in speed cap, a hard limit that shapes everything from how stars shine to how cause and effect unfold. That limit is usually described as the speed of light, yet the ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. One of the fundamental rules we all learn in physics — set forth by ...

In a Universe governed by General Relativity, filled with matter-and-energy, a static solution is not possible. That Universe must either expand or contract, with measurements revealing very quickly ...

Add Yahoo as a preferred source to see more of our stories on Google. While it’s difficult to say for sure who the fastest superhero is—there are plenty of challengers to The Flash—determining the ...

In 1676, by studying the motion of Jupiter's moon Io, Danish astronomer Ole Rømer calculated that light travels at a finite speed. Two years later, building on data gathered by Rømer, Dutch ...

There’s something about comparing the size of objects—say, moons or sci-fi starships—that is endlessly appealing. But while comparisons we’ve seen cover subsets of stuffs, none have looked at the big ...