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:
“She would rather light a candle than curse the darkness, and her glow has warmed the world.”
—Adlai Stevenson (1900–1965)
“When I consider how my light is spent,
Ere half my days, in this dark world and wide,
And that one talent which is death to hide
Lodged with me useless.”
—John Milton (1608–1674)
“The march interrupted the light afternoon.
Cars stopped dead, children began to run,
As out of the street-shadow into the sun
Discipline strode....”
—Philip Larkin (1922–1986)