Light
Light propagates at 299,792,458 m/s, often approximated as 300,000 kilometres per second or 186,000 miles per second. The speed of light (or c) is the speed of all massless particles and associated fields in a vacuum, and it is the upper limit on the speed at which energy, matter, and information can travel.
Read more about this topic: Motion (physics)
Famous quotes containing the word light:
“Signal smokes, war drums, feathered bonnets against the western sky. New messiahs, young leaders are ready to hurl the finest light cavalry in the world against Fort Stark. In the Kiowa village, the beat of drums echoes in the pulsebeat of the young braves. Fighters under a common banner, old quarrels forgotten, Comanche rides with Arapaho, Apache with Cheyenne. All chant of war. War to drive the white man forever from the red man’s hunting ground.”
—Frank S. Nugent (1908–1965)
“The popular definition of tragedy is heavy drama in which everyone is killed in the last act, comedy being light drama in which everyone is married in the last act.”
—George Bernard Shaw (1856–1950)
“You who have condemned me, I know your kind. Your forebears poisoned Socrates, burned Joan of Arc, hanged, tortured all those whose only offense was to bring light into darkness.”
—Karl Brown (1897–1990)