Light seems so ordinary — the flick of a lamp, the glow of the sun — that it’s easy to forget it carries one of nature’s deepest secrets. The speed of light is the rate at which light travels. At exactly 299,792 kilometers per second.
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The method involves stitching together many thin “slices” of light reflecting off an object. The speed of light in a vacuum is a constant value that is denoted by the letter c and is defined as exactly 299,792,458 meters. What is the speed of light, and why does it matter?
Speed of light, speed at which light waves propagate through different materials.
The idea that light speed is the ultimate speed limit raises profound philosophical questions. 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. The speed of light is 299,792,458 meters per second and that constant tells us much about cause and effect in the universe. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458.
It challenges our notions of absolute time and space, suggesting that reality is far. For many practical purposes, light and other electromagnetic waves will appear to propagate. All forms of electromagnetic radiation, including visible light, travel at the speed of light. In this video, discover the real science behind the speed of light—299,792,458 meters per second—and why this cosmic.
