this post was submitted on 28 Apr 2026
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xkcd #3238: Soniferous Aether (europe.pub)
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xkcd #3238: Soniferous Aether

Title text:

Imagine you could ride alongside a sound wave. It would probably be pretty cool, right? We're putting in a departmental budget request to buy a really fast plane so we can check it out.

Transcript:

Transcript will show once it’s been added to explainxkcd.com

Source: https://xkcd.com/3238/

explainxkcd for #3238

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[–] kieron115@startrek.website 2 points 2 weeks ago* (last edited 2 weeks ago)

Do the individual photons slow down? No. But those photons get absorbed by atoms along the way and then a new photon of light is emitted (nearly, but not literally, instantly) which then continues along it's merry way at C until it encounters another atom. What slows down is the net speed of transport through a given medium.