A dark point inside a wave of light sounds like a contradiction. It is also something researchers say they have now viewed in real time, moving so quickly that, by one measure, it outran light itself.

Add Yahoo as a preferred source to see more of our stories on Google. The light echo around the star V838 Monocerotis as seen by the Hubble Space Telescope in November 2005. (NASA, ESA and H. Bond ...

Dark spots within lightwaves break the speed of light in new research confirming a half-century-old prediction.

Addressing a controversy first raised around 1910, two physicists have performed experiments with the aid of an engineer that validate anew the special theory of relativity’s limitations on the speed ...