299,792,458
The speed of light in a vacuum is exactly 299,792,458 metres per second. It’s such a fundamental constant that since 1983 it has actually defined the metre — one metre is the distance light travels in 1/299,792,458 of a second.
The speed of light in a vacuum is exactly 299,792,458 metres per second. It’s such a fundamental constant that since 1983 it has actually defined the metre — one metre is the distance light travels in 1/299,792,458 of a second.