Sure you've heard of sound echoes, but have you heard of…
Light ECHOES echoes ᵉᶜʰᵒᵉˢ?
https://www.scientificamerican.com/article/what-are-light-echoes-and-why-do-they-matter/
Phil Plait
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2025-08-08 18:14:09 UTC
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2025-08-08 18:14:09 UTCEvent JSON
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