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Speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second. play_circle_outline. Scientists simulating traveling at the speed of light.Contunico Â© ZDF Enterprises GmbH, Mainz.
Light is a form of energy that our eyes can see. It is made up of billions of tiny particles known as photons. It is not matter because it has no mass and does not occupy space. It also travels in a straight line. It travels at a very fast speed -- 299,792,458 metres per seconds to be exact.