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:
““Come unto me,” [Krokowski] was saying, though not in those words, “come unto me, all ye who are weary and heavy-laden”.... He spoke of secret suffering, of shame and sorrow, of the redeeming power of the analytic. He advocated the bringing of light into the unconscious mind.”
—Thomas Mann (1875–1955)
“Awareness of the stars and their light pervades the Koran, which reflects the brightness of the heavenly bodies in many verses. The blossoming of mathematics and astronomy was a natural consequence of this awareness. Understanding the cosmos and the movements of the stars means understanding the marvels created by Allah. There would be no persecuted Galileo in Islam, because Islam, unlike Christianity, did not force people to believe in a “fixed” heaven.”
—Fatima Mernissi, Moroccan sociologist. Islam and Democracy, ch. 9, Addison-Wesley Publishing Co. (Trans. 1992)
“the light of a whole life dies
When love is gone.”
—Francis William Bourdillon (1852–1921)