The speed of light is 299,792,458 meters per second and that constant tells us much about cause and effect in the universe. Skip to content. Introducing the all-new Astronomy.com Forum!

In his new book Life at the Speed of Light: From the Double Helix to the Dawn of Digital Life, Craig Venter writes of the brave new world synthetic biology may some day deliver: from consumer ...

In science fiction, spaceships moving at or beyond lightspeed enable all manner of universal exploration. But in Earth-bound reality, traveling at the speed of light (299,792,458 meters per second ...

So, what is the speed of light? Light moves at an incredible 186,000 miles per second (300,000 kilometers per second), equivalent to almost 700 million mph (more than 1 billion km/h).

This is the number that we think of as the speed of light C, but more accurately, this is just the speed. The light travels in a vacuum, and it's true. Nothing can go faster than that but light ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 ...

That means that when light is in glass, it travels with a speed that's only 0.667 times as fast as in a vacuum, with a value of 1.97 x 10 8 m/s. How about some other materials?

Light, which moves at about 670 million miles per hour, is the ultimate cosmic speed limit. Not only that, special relativity holds that the speed of light is a constant no matter who or what is ...