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 ...

Those who have lived in Raleigh since the 1990s may remember the controversial installation of the Light + Time Tower near the Capital Boulevard entrance to downtown Raleigh. But while Raleigh was ...

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 ...

The question has been debated ever since Newton. But physicists are still in the dark about whether light is 1) a wave, 2) a particle or 3) a combination of both. Sometimes it behaves like one, ...

Can we turn back time? Ask a savvy physicist, and the answer will be “it depends.” Schemes for retrograde time travel abound but usually involve irreconcilable paradoxes and rely on outlandish ...