An experiment has visualized a prediction about objects traveling at the speed of light known as the Terrell-Penrose effect, ...

Chris Impey receives funding from the National Science Foundation and the Hearst Foundation. Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. Neutrino detectors, like the one used in the BOREXINO collaboration ...

The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...

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 ...