Light is faster than anything else in the known universe, though its speed can change depending on what it's passing through. When you purchase through links on our site, we may earn an affiliate ...

Light speed would allow instant trips across Earth and minutes to reach the Sun, but even at 300,000 km/s the expanding ...

As it heads out of the solar system never to return, the deep space probe Voyager 1 is headed for yet another cosmic ...

In one of his videos from earlier this year, YouTuber Joe Scott, host of “Answers With Joe,” takes on the glaring question of the speed of light. In a vacuum, the speed of light is 299,792 kilometers ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. One of Einstein's most famous fundamental laws is that nothing in the ...

A team of Australian scientists has proposed that the speed of light may not be a constant, a revolutionary idea that could unseat one of the most cherished laws of modern physics -- Einstein's theory ...

If there is an absolute law in the universe, it’s that nothing can travel faster than the speed of light. For science-fiction enthusiasts, that’s a bit depressing. Space is big, and while the speed of ...

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 ...

Researchers say they have created fiber cables that can move data at 99.7 percent of the speed of light, all but eliminating the latency plaguing standard fiber technology. There are still data loss ...

It's the most fundamental law of special relativity, and the realization that led Einstein to some of the greatest physics breakthroughs of all time: the idea that nothing can travel faster than light ...