A light echo is a phenomenon observed in astronomy. Analogous to an echo of sound, a light echo is produced when a sudden flash or burst of light, such as that observed in novae, is reflected off a source and arrives at the viewer some time after the initial flash. Because of their geometries, light echoes can produce the illusion of superluminal speeds.
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Famous quotes containing the words light and/or echo:
“Ye are the light of the world.”
—Bible: New Testament Jesus, in Matthew, 5:14.
From the Sermon on the Mount.
“Bondage is hoarse and may not speak aloud,
Else would I tear the cave where Echo lies
And make her airy tongue more hoarse than mine
With repetition of “My Romeo!””
—William Shakespeare (1564–1616)