Imagine this: a tiny needle hurtling toward Earth at the speed of light. At first glance, it might sound like no big deal.

From early experiments with lanterns to Einstein’s revelations about space and time, the speed of light has proven to be far ...

When light travels unimpeded, it loses no energy. It can maintain that 186,000-mile-per-second speed forever. Discover the latest in science, tech, and space with over 100,000 subscribers who rely on ...

John was not the Light, but was sent to bear witness of that Light. That was the true Light, which lighteth every man that ...