Scientists who believe in evolution don't like the idea of a variable speed of light, because it throws all dating efforts based on present conditions extrapolated to the past out the window. The rate ...

(via PBS Space Time) One of the most fundamental physics facts is that the speed of light in a vacuum is constant for all observers. But can we really be sure that the speed of light wasn’t different ...

A humble elevator shaft was recently used in a test of the constancy of the speed of light. Credit: Jason Wong/Flickr, CC ...

On one hand, the speed of light is just a number: 299,792,458 meters per second. And on the other, it’s one of the most important constants that appears in nature and defines the relationship of ...

Second, it seems to hold in this concept that if something affects the speed of light, everything else will be affected similarly so that light will always be the fastest thing in any given frame of ...

Let’s explore how constant this speed of light fundamental constant really is. One of the most fundamental physics facts is that the speed of light in a vacuum is constant for all observers. But can ...