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:
“But seldom the laurel wreath is seen
Unmixed with pensive pansies dark;
There’s a light and a shadow on every man
Who at last attains his lifted mark—
Nursing through night the ethereal spark.
Elate he never can be;
He feels that spirits which glad had hailed his worth,
Sleep in oblivion.—The shark
Glides white through the phosphorus sea.”
—Herman Melville (1819–1891)
“Like a poet hidden
In the light of thought,
Singing hymns unbidden,
Till the world is wrought
To sympathy with hopes and fears it heeded not:”
—Percy Bysshe Shelley (1792–1822)
“The light is there, and colors surround us. However, if there were no light nor colors in our own eye, we wouldn’t perceive such things outside of us.”
—Johann Wolfgang Von Goethe (1749–1832)