Traveling at the speed of light 300,000 km per second sounds impossibly fast, yet even this ultimate velocity pales against ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

The most distant galaxies in this deep field image from the James Webb Space Telescope appear as small, faint dots—and are receding from us faster than the speed of light due to cosmic expansion. If ...

On November 21, 1676, the Danish astronomer Ole Rømer discovered the speed of light. Before Rømer figured it out, scientists thought that light travels instantaneously, or infinitely fast. Rømer ...

As I watched shooting stars from our campsite in the Virgin River Canyon south of St. George, Utah, I could not get my mind around an endless universe. How can something go on forever? I am used to a ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

During a meeting with the Mars Exploration Program Analysis Group, an internal NASA working crew dedicated to supporting missions to Mars included a pitch from Elon Musk's SpaceX to deploy Starlink ...

The first to attempt to calculate the speed of light was made in 1638, albeit unsuccessfully, by the “polymath from Pisa” Galileo Galilei, an Italian physicist, astronomer, natural philosopher, ...