On one hand, the speed of light is just a number: 299,792,458 meters per second. And on the other, it’s one of the most important constants that appears in nature and defines the relationship of ...

Special relativity and the speed of light. Albert Einstein much later proposed the idea of what’s now known as special relativity to explain some confusing observations that didn’t have an ...

That’s very close to the speed of light, but not quite faster than it. Indeed, to our knowledge so far, nothing on or off our planet can travel faster than the speed of light.

Everyone measuring the speed of light will get the same result, no matter where they are or how fast they are moving. Let’s say you’re in the car driving at 60 miles per hour and your friend ...

The idea was first hypothesized about 70 years ago. In a bizarre repercussion of Albert Einstein's Special Theory of Relativity, objects traveling close to the speed of light appear flipped over ...

Science educator and engineer Bill Nye explains what a light-year is, why we have a unique measurement for outer space, and why it’s “the coolest thing ever that there’s so much we don’t ...