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From: David Brown <david.brown@hesbynett.no>
Newsgroups: comp.arch
Subject: Re: Is Intel exceptionally unsuccessful as an architecture designer?
Date: Mon, 7 Oct 2024 12:45:34 +0200
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On 07/10/2024 08:29, Niklas Holsti wrote:
> On 2024-10-07 1:08, Brett wrote:
>> Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
>>> On Fri, 4 Oct 2024 17:59:03 -0000 (UTC), Brett wrote:
>>>
>>>> A gas cannot emit the spectrum we see from the sun, liquid metallic
>>>> hydrogen can.
>>>
>>> The spectrum of the Sun is primarily the continuous emissive one of a
>>> “black body” at a surface temperature of 6500K or thereabouts.
>>>
>>> Superimposed on that are absorption lines corresponding to a range of
>>> elements, representing cooler substances in the surrounding 
>>> “photosphere”,
>>> I think it’s called.
>>>
>>> Which of these lines do you think is characteristic of this mythical
>>> “liquid metallic hydrogen” of yours?
>>>
>>> Fun fact: originally it was thought that those lines in the spectra 
>>> of the
>>> Sun and other stars were characteristic of the entire makeup of the 
>>> bodies
>>> concerned. In other words, they were full of elements much like those 
>>> that
>>> make up the Earth and other planetary bodies.
>>>
>>> A young doctorate student named Cecilia Payne, after some careful study,
>>> came to the remarkable conclusion that stars were mostly hydrogen and
>>> helium, and these spectral lines were due, in effect, to relatively 
>>> small
>>> amounts of contaminants in among that bulk of hydrogen and helium.
>>>
>>>> Gases do not show the pond ripples from impacts that we see from the 
>>>> sun
>>>> surface.
>>>
>>> What “impacts on the sun surface”?
>>
>> Watch the first few minutes of the first video in the playlist to see a
>> solar eruption and some of that mass crashing back down on the sun 
>> surface,
>> causing pond ripples. The idea of a plasma gas sun dies right there.
> 
> 
> Stratified fluid (non-plasma) atmospheres can support pond-like waves:
> 
> https://en.wikipedia.org/wiki/Gravity_wave#Atmosphere_dynamics_on_Earth.
> 

Note to Brett - gravity waves in a fluid are completely different from 
gravitational waves, such as those generated by black hole collisions 
and detected by LIGO.  You probably have some other magic snake oil 
beliefs about those, but don't get them confused with gravity waves in a 
fluid.

> Plasma can support /many/ kinds of waves because of the coupling of the 
> charged particles to magnetic fields:
> 
> https://en.wikipedia.org/wiki/Waves_in_plasmas
> 
> I don't claim to know what kind of wave was shown in the video of the 
> solar eruption -- intuitively I would plump for gravity waves. But I 
> don't think liquid metallic hydrogen is needed to explain it.
> 

Without having seen the video, my gut instinct is that a liquid surface 
on the sun could not come close to explaining any easily discernable waves.

Coronal mass eruptions send most of their mass outwards - little falls 
back, and it is spread over a large area.  Since liquid metallic 
hydrogen requires incredibly high pressures and incredibly high 
densities, if it existed on the surface of the sun (and it certainly 
does /not/ exist there), any waves on it would have extremely small 
amplitude.