1. light echoPhysics
2. Light echoA 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 “Light echo” on English Wikipedia
Read “光エコー” on Japanese Wikipedia
Read “Light echo” on DBpedia
Read “Light echo” on English Wikipedia
Read “光エコー” on Japanese Wikipedia
Read “Light echo” on DBpedia
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