Last Updated
：2025/11/22
light echo
（ plural ）
（ plural ）
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(astronomy) A 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.
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light echo
The astronomers discovered a faint light echo around the supernova, revealing dust structures many light-years away.
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The astronomers discovered a faint light echo around the supernova, revealing dust structures many light-years away.
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