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.
Read more about Light Echo: Explanation, Examples
Famous quotes containing the words light and/or echo:
“If with light head erect I sing,
Though all the muses lend their force,
From my poor love of anything,
The verse is weak and shallow as its source.
But if with bended neck I grope,
Listening behind me for my wit,
With faith superior to hope,
More anxious to keep back than forward it,”
—Henry David Thoreau (1817–1862)
“Return our hymn,
like echo fling
a sweet song,
answering note for note.”
—Hilda Doolittle (1886–1961)