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:
“No one after lighting a lamp puts it under the bushel basket, but on the lampstand, and it gives light to all in the house. In the same way, let your light shine before others, so that they may see your good works and give glory to your Father in heaven.”
—Bible: New Testament, Matthew 5:15,16.
“I cease my song for thee,
From my gaze on thee in the west, fronting the west, communing with thee,
O comrade lustrous with silver face in the night.
Yet each to keep and all, retrievements out of the night,
The song, the wondrous chant of the grey-brown bird,
And the tallying chant, the echo aroused in my soul,
With the lustrous and drooping star with the countenance full of woe,”
—Walt Whitman (1819–1892)