Editing 3238: Soniferous Aether

{{comic
| number    = 3238
| date      = April 27, 2026
| title     = Soniferous Aether
| image     = soniferous_aether_2x.png
| imagesize = 290x466px
| noexpand  = true
| titletext = 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.
}}

==Explanation==
{{incomplete|This page was created recently by a BOT THAT BREATHES SONIFEROUS AETHER. Don't remove this notice too soon.}}

Beginning in the late 1690s, scientists posited a {{w|luminiferous aether}} to explain properties of light (especially its ability to travel in a vacuum) which should not be possible for a wave. The 1887 {{w|Michelson–Morley experiment}} disproved its existence, by demonstrating that the {{w|speed of light}} was constant, regardless of relative movement through the supposed aether.

In this comic, [[Cueball]] and [[Ponytail]] have noticed that the {{w|speed of sound}} is ''not'' constant, and so present their new theory, by analogy, of a 'soniferous aether' to explain the properties of sound. However, we already have a name for this 'aether', which is 'matter'. In most cases we encounter, this means air. Air surrounds us so ubiquitously that we often tend to treat it as if it were empty space. Although of course that is untrue, and if it were actually empty space, life on Earth would not fare too well.{{Citation needed}}

The title text references {{w|Albert Einstein|Albert Einstein's}} thought experiment where he imagined riding alongside a light particle/wave (which was referenced in [[2959: Beam of Light]]), but with a sound wave instead. Travelling at the speed of sound can be accomplished with a fast airplane. Usually these would be military aircraft, though the {{w|Tu-144}}, {{w|Concorde}}, and (briefly) [https://www.smithsonianmag.com/air-space-magazine/i-was-there-when-the-dc-8-went-supersonic-27846699/ a DC-8] were commercial aircraft that did achieve supersonic flight, and the {{w|Boom Overture}} is in the process of being tested as of the comic's publication.

Reinventing things from first principles has previously [[2834|been discussed]] [[2724|multiple times]] on [[xkcd]].

==Transcript==
:[Ponytail is addressing an unseen audience in front of her while she holds her hand out towards them. She is standing on a podium with Cueball behind her. Cueball holds an arm out behind him indicating a screen behind him showing a graph with three sine waves with different wavelengths. The top has two cycles, the middle four cycles and the bottom one cycle.]
:Ponytail: We all know the speed of light is constant for all observers. 
:Ponytail: But our experiments show that the speed of sound '''''changes''''' based on the observer's motion.
:Ponytail: Thus, we posit the existence of the '''''soniferous aether''''', a medium that fills the space between us and carries sound waves.

:[Caption below the panel:]
:Sometimes physicists forget that air exists and rediscover it from first principles.

{{comic discussion}}<noinclude>

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Ponytail]]
[[Category:Physics]]