Talk:Q1823351
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Autodescription — light echo (Q1823351)
description: physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance;analogous to an echo of sound, it mostly only manifests itself over astronomical distances
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[edit]en:Echo (phenomenon) (reflection of wave that arrives at the observer with a delay after the direct wave)? --Fractaler (talk) 14:08, 31 October 2017 (UTC)