What our relatively immediate form of communication actually takes. New advancements in Compressing Light.
The speed of light is a constant used in physical calculations, measured at 299,792,458 meters per second. The concept of the speed of light blows my mind. People have learned to contain it and direct it to carry information. We use it to express our ideas through pixels, we manipulate and store our ideas in light. Really beautiful when one thinks about it.
“The speed of light can be assigned a definite numerical value because the fundamental SI unit of length, the metre, has been defined since October 21, 1983, as the distance light travels in a vacuum in 1/299,792,458 of a second; in other words, any increase in the measurement precision of the speed of light would reduce the uncertainty in practical realizations of the metre but would not alter the numerical value of c. The approximate value of 3×108 m/s is commonly used in rough estimates (the error is 0.07%).”