Light echo | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Light_echo


00:00:43 1 Explanation
00:02:43 2 Examples
00:02:53 2.1 V838 Monocerotis
00:03:29 2.2 Supernovae
00:05:48 2.3 Cepheids
00:06:15 2.4 Nova Persei 1901
00:07:29 3 Quasar light and ionisation echoes
00:09:16 4 See also



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SUMMARY
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A light echo is a physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance. The phenomenon is analogous to an echo of sound, but due to the much faster speed of light, it mostly only manifests itself over astronomical distances.
For example, a light echo is produced when a sudden flash from a nova is reflected off a cosmic dust cloud, and arrives at the viewer after a longer duration than it otherwise would have taken with a direct path. Because of their geometries, light echoes can produce the illusion of superluminal motion.