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From: Don <g@crcomp.net>
Newsgroups: rec.arts.sf.written
Subject: Re: "Caves of the Druufs (Perry Rhodan #72)" by Kurt Mahr
Date: Thu, 30 Jan 2025 21:51:56 -0000 (UTC)
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Lynn McGuire wrote:
> "Caves of the Druufs (Perry Rhodan #72)" by Kurt Mahr
>    https://www.amazon.com/Caves-Druufs-Perry-Rhodan-72/dp/3441660560/
>
> Book number seventy-two of a series of one hundred and thirty-six space
> opera books in English.  The original German books, actually pamphlets,
> number in the thousands.  The English books started with two translated
> German stories per book translated by Wendayne Ackerman and transitioned
> to one story per book with the sixth book.  And then they transition
> back to two stories in book #109/110.  The Ace publisher dropped out at
> #118, so Forrest and Wendayne Ackerman published books #119 to #136 in
> pamphlets before stopping in 1978.  The German books were written from
> 1961 to present time, having sold two billion copies and even recently
> been rebooted again.  I read the well printed and well bound book
> published by Ace in 1975 that I had to be very careful with due to age.
> I bought an almost complete box of Perry Rhodans a decade or two ago on
> ebay that I am finally getting to since I lost my original Perry Rhodans
> in The Great Flood of 1989.  In fact, I now own book #1 to book #106,
> plus the Atlan books, and some of the Lemuria books.
>    https://en.wikipedia.org/wiki/Perry_Rhodan
>
> BTW, this is actually book number 80 of the German pamphlets written in
> 1963.  There is a very good explanation of the plot in German on the
> Perrypedia German website of all of the PR books.  There is automatic
> Google translation available for English, Spanish, Dutch, Japanese,
> French, and Portuguese.
>    https://www.perrypedia.de/wiki/In_den_H%C3%B6hlen_der_Druuf
>
> In this alternate universe, USSF Major Perry Rhodan and his three fellow
> astronauts blasted off in a three stage rocket to the Moon in their
> 1971.  The first stage of the rocket was chemical, the second and third
> stages were nuclear.  After crashing on the Moon due to a strange radio
> interference, they discover a massive crashed alien spaceship with an
> aged male scientist (Khrest), a female commander (Thora), and a crew of
> 500.  It has been over seventy years since then and the Solar Empire has
> flourished with tens of millions of people and many spaceships
> headquartered in the Gobi desert, the city of Terrania.  Perry Rhodan
> has been elected by the people of Earth to be the World Administrator
> and keep them from being taken over by the robot administrator of Arkon.
>
> Perry Rhodan is missing and presumed dead on Earth !  The Earthers are
> rioting and his son demands to take over the one world government that
> Perry Rhodan installed and led for several decades now.  But in reality,
> he was captured by the Arkonides and then captured by the Druufs.
> General Deringhouse has brought the light cruiser California to the
> Druuf Universe and is investigating some very strange gravity signals.

Here's a re-post of my review from late last summer:

This adventure's set on a planet called Roland. Previously posted
parallels (by authorial intention or otherwise) to Roland's horn
Olifant are available here:

<https://rec.arts.sf.written.narkive.com/AvqRC9JP/ot-sf-mythology#post7>

In this PR episode, Perry uses gravity waves to send an S.O.S. signal.
Near the bottom of the above link there's also an anecdote about walking
on eggshells in order to enlighten Einstein's ego after Albert
erroneously said gravity waves do not exist. It turns out such a
statement contradicts Einstein's own theory.

This novella continues to exposit hyperspace. Poe's prose poem _Eureka_
anticipates hyperspace. Pilot wave theory incorporates hyperspace into
its metaphysical framework. Both are covered here:

<https://rec.arts.sf.written.narkive.com/XrVRpBCj/hyperspace-from-poe-to-pilot-to-perry#post2>

Feynman put forth a hot plate metaphor for the curvature of spacetime.
And Ouspensky provides suitable dimensional nomenclature. Both concepts
can be viewed here:

<https://rec.arts.sf.written.narkive.com/nKdzKYQL/the-bonds-of-eternity-perry-rhodan-69-by-clark-darlton#post2>

A basic understanding of tensors is necessary to continue beyond this
point. Dan Fleisch provides an adequate introduction in his short
"What's a Tensor?" video:

<https://www.youtube.com/watch?v=f5liqUk0ZTw>

With all of the preliminaries now out of the way, it's time to ponder
something new and old: Einstein Field Equations (EFE). It took Albert
ten years to develop EFE to describe the spacetime curvature of
hyperspace.
    He did all of the hard work. As an aside, Sabine Hossenfelder

<https://duckduckgo.com/?q=sabine+hossenfelder+einstein&iax=videos&ia=videos>

says EFE are fairly easy to understand, relatively speaking.

Einstein Field Equation: Learn its Definition and Derivation
<https://testbook.com/physics/einstein-field-equation>

Einstein Field Equations Fully Written Out: What Do They Look Like Expanded?
<https://profoundphysics.com/einstein-field-equations-fully-written-out-what-do-they-look-like-expanded/>

Danke,

--
Don.......My cat's  )\._.,--....,'``.     https://crcomp.net/reviews.php
telltale tall tail /,   _.. \   _\  (`._ ,.    Walk humbly with thy God.
tells tall tales.. `._.-(,_..'--(,_..'`-.;.'    Make 1984 fiction again.