Unsurprisingly it’s Adventure 12: Secret of the Ancients. The UPP for “an industrial complex on a barren world” is A700???-?, and in this case I think it takes the “unknown” meaning.

From my quick scan I think it’s the only UPP mentioned in the adventure, but from the descriptions of the three systems it doesn’t look like they have any megastructures or unusual worlds features.

Interestingly, in the Mongoose version The Vacant System from CT A12, reserved for future use by Grandfather becomes The Abandoned System, a “graveyard of old experiments, outdated equipment and other junk” (p 91).

From: Phil Pugliese - philpugliese at yahoo.com
Sent: Friday, 1 May 2020 07:25
To: xxxxxx@simplelists.com
Subject: Re: [TML] Where the UPP fails me...

The first pocket universe I recall was the one in the 'Marches where G'father himself resided.

(Of course there's no way of knowing whether or not it's really him or one of his clones, is there?)

I was three systems big & was introduced in one of the last CT LBB Adventures that GDW published.

----------------------------------------------------------------------------------------------------------------------------------------

On Thursday, April 30, 2020, 12:24:15 PM MST, xxxxxx@gmail.com <xxxxxx@gmail.com> wrote:

There will always be a 'it's cool!' factor in any game. Although, we did avoid the insanity of lightsabers. Then again, in their own universe, I still find them cool.

Even more impressive is the little pocket universe that some of Yaskodray's children retreated into... I forget what MT-era product that was in (DGP product maybe?) but that too was 'magic'.

I think Traveller has room to seem (for some groups) a bit more like Space Opera and for others it wants to lean towards Hard Scifi. For others, simply the tramp trader flying as best it can. It's a broad game which makes it interesting. It's a good platform for customization and making a unique and distinct personal TU.

On Thu, Apr 30, 2020 at 12:23 PM Vareck Bostrom <xxxxxx@gmail.com> wrote:

Yes, just like the ancients made space be all 2 dimensional and
planets move in perfectly circular orbits. It's a little funny how
much Niven's influence came into Traveller, or at least these
discussions: Ringworlds and Klemperer Rosettes are both dynamically
unstable and both seemingly made their way from Ringworld to
Traveller.

On Thu, Apr 30, 2020 at 8:49 AM Phil Pugliese - philpugliese at
yahoo.com (via tml list) <xxxxxx@simplelists.com> wrote:
>
> And that's the big mystery of the one, or ones, that G'father, or his clones, created.
>
> Just how did he get them to be stable?
>
> But then it was 'The Ancients' wasn't it?
>
> --------------------------------------------------------------------------------------------------------------------
>
> On Thursday, April 30, 2020, 01:51:04 AM MST, Vareck Bostrom <xxxxxx@gmail.com> wrote:
>
>
> It's covered in brief on the wiki page for it:
>
> https://en.m.wikipedia.org/wiki/Klemperer_rosette
>
> Simulations of this system[2] (or a simple linear perturbation analysis) demonstrate that such systems are unstable: any motion away from the perfect geometric configuration causes an oscillation, eventually leading to the disruption of the system (Klemperer's original article also states this fact). This is the case whether the center of the rosette is in free space, or itself in orbit around a star. The short-form reason is that any perturbation destroys the symmetry, which increases the perturbation, which further damages the symmetry, and so on.
>
> On Thu, Apr 30, 2020, 1:32 AM <xxxxxx@gmail.com> wrote:
>
>
>
> On Wed, Apr 29, 2020 at 6:16 PM Vareck Bostrom <xxxxxx@gmail.com> wrote:
>
> Rosettes are not dynamically stable, even when they are of the same mass.
>
>
> I kind of thought they would be. What makes them not a stable configuration? Does it require some sort of eccentricity or the action of other bodies in the system to cause the instability?
>
> TomB
>
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