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 ...

The constancy of the speed of light is a pillar of modern physics, but questions persist about its absolute universality.

According Einstein's Theory of Relativity, the speed of light operates as a universal speed limit on anything with mass. When you purchase through links on our site, we may earn an affiliate ...

Anyone who took Physics 101 has had this fact drilled into their head: The speed of light is a constant, traveling at 186,000 miles per second. In fact, it’s the cornerstone of much of modern physics, ...

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 ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Back in 2018, astronomers examining the ruins of two collided ...

Here, a calcite crystal is struck with a laser operating at 445 nanometers, fluorescing and displaying properties of birefringence. Unlike the standard picture of light breaking into individual ...

They recreate how a camera would see objects traveling at 99.9% of the speed of light, revealing surprising relativistic illusions.

The electrons are trapped in an endless loop around the planet. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. In the swirl of a perfect solar ...

I'll be honest: I didn't know that an iPhone was able to do a lidar scan. (The iPhone 12 Pro, 13 Pro, and iPad Pro can all do it.) When I found out that my phone could, I became obsessed with scanning ...