On 06/09/2023 01:23, RichA wrote:
> https://www.youtube.com/watch?v=uvubLp5o5Wg
>
A surprisingly good presentation of a complex subject of the finest
structure of spacetime on the Plank scale and well worth a watch.

Your subject title as ever is crass and wilfully misleading.

JWST *is* a multispectral instrument in the infra-red bands. That was
the whole reason for building it to explore those wavebands at very high
resolution. It has performed admirably in that task.

Hubble can also do diffraction limited UV but the JWST mirrors cannot.

Any test of quantum foam will likely be done with a pair or perhaps
three of UV telescopes on a Michelson and Pease style rigid bar
interferometer in orbit. The thing of interest being the presence of
interference fringes on extremely remote (presumed) bright point sources
in the hard UV. Shorter wavelengths providing a more sensitive test.

Presumed point sources being a bit of a sticking point. Many radio
astronomy calibrator sources are not quite good enough point sources
(although they were when they were first chosen) now that
interferometric scopes are so big (1 Earth diameter)!

--
Martin Brown

Nature thrives on non-periodicity and the balance between order and disorder or harmony and invention rather than the language of quantum notions of right/wrong, I/0 , is the cat dead or alive and other variations on that theme.

I understood this over two decades ago and, true to form, mathematicians ran away from it like so many other things before.

https://groups.google.com/g/sci.physics/c/_zO9GpWrWCI/m/GFH4NEKP1EgJ?hl=en

It wasn't a difficulty for me as there is a specific type of geometry that covers animate and inanimate objects and especially our home planet which explodes with the Phi proportion as it resonates with spiritual and inspirational people through history.

When I see non-periodic tiling, I see the geometric DNA of the Universe written as four angles in proportion to the main angle of 36 degrees-

https://imgur.com/gallery/UV2tvOJ

My heart sings as a Christian at the wonders of creation and the Spirit/Inspiration that encompasses it.

On 07/09/2023 19:54, RichA wrote:
> On Wednesday, 6 September 2023 at 08:19:29 UTC-4, Martin Brown wrote:
>> On 06/09/2023 01:23, RichA wrote:
>>> https://www.youtube.com/watch?v=uvubLp5o5Wg
>>>
>> A surprisingly good presentation of a complex subject of the finest
>> structure of spacetime on the Plank scale and well worth a watch.
>>
>> Your subject title as ever is crass and wilfully misleading.
>>
>> JWST *is* a multispectral instrument in the infra-red bands.
>
> Your idea of multispectral is highly restricted.

By the physics of the JWST instrument which was designed for far IR and
has gold reflective coatings and fancy shielding for that purpose.

A UV telescope would need optical surfaces to a much higher precision
than its working wavelength - especially if as would be needed for the
quantum foam test they were looking for very subtle diffraction effects.

I will confess that until comparatively recently I had believed it was
named after the Webb Deep Sky Society's founder Rev T. W. Webb.

https://www.webbdeepsky.com/wbg/twwebb.html

Author of "Celestial Objects for Common Telescopes"

https://www.amazon.co.uk/Celestial-Objects-Telescopes-Cambridge-Collection/dp/1108014070

--
Martin Brown

On Thursday, September 7, 2023 at 12:56:12 PM UTC-7, Martin Brown wrote:

> I will confess that until comparatively recently I had believed it was
> named after the Webb Deep Sky Society's founder Rev T. W. Webb.
>
> https://www.webbdeepsky.com/wbg/twwebb.html
>
> Author of "Celestial Objects for Common Telescopes"
>
> https://www.amazon.co.uk/Celestial-Objects-Telescopes-Cambridge-Collection/dp/1108014070

There was, of course, an uprising in certain circles that would have preferred that the telescope be names after your"other" Webb...

https://www.scientificamerican.com/article/nasa-needs-to-rename-the-james-webb-space-telescope/

.... but we all know how that turned out.

I still have my Webb Society books from many decades ago.

On Thursday, September 7, 2023 at 7:44:23 PM UTC-4, palsing wrote:

> There was, of course, an uprising in certain circles that would have preferred that the telescope be names after your"other" Webb...
>
> https://www.scientificamerican.com/article/nasa-needs-to-rename-the-james-webb-space-telescope/
>
> ... but we all know how that turned out. >

That article calls for a real-life implementation of Roko's Basilisk.