This jet streaming out of a supermassive black hole is traveling at nearly the speed of light. Superman may fly faster than a speeding bullet, but he'd easily lose in a race against a beam of light, ...

The universe is expanding. But how fast? Why is this happening? And what will be the universe’s ultimate fate? These are big, literally cosmic questions, and astronomers continue to struggle to nail ...

So, you’re driving a car at half the speed of light. (Both hands on the wheel, please.) You turn on the headlights. How fast would you see this light traveling? What about a person standing by the ...