What is the purpose of light? How does light work? Why does light exist? This video explores the longstanding debate over whether light is composed of particles or waves. Albert Einstein demonstrated ...

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 ...

Slowing down light is not as easy as it sounds. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Breaking space news, the latest updates on rocket ...