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Note: I decided to repost this since Freeman Dyson didn't postulate a
hollow shell, but a massive swarm of objects.
The short version: this book was a disappointment.
These two books have recently been reprinted by a new publisher and
Stirling wrote a 3rd title, _Lords of Creation_ to go with them. People
are exploring that sphere, but NONE of them appear to be aware
that a hollow sphere has no internal gravity force. They are all walking >around in a 1 g field.
Note: I decided to repost this since Freeman Dyson didn't postulate a
hollow shell, but a massive swarm of objects.
The short version: this book was a disappointment.
About 2 decades ago, Stirling wrote 2 books that modernized the mid 20th century Planetary Romance genre (_The Sky People_ and _In the Courts of
the Crimson Kings_). Both Venus and Mars had been terraformed during the Mesozoic by a highly advanced interstellar civilization and had been
seeded by life from Earth (with periodic inserts of more species,
including humans, up to about 5 thousand years ago for Venus and perhaps
200 hundred thousand years ago for Mars). The most advanced cultures on
Venus were Bronze age, but Mars had a uniform civilization with
extremely advanced bio-tech on a dying planet. In the epilog of _In the Courts of the Crimson Kings_ some gates were opened that connected Venus
and Mars to other worlds, and Earth to a hollow sphere, 2 Astronomic
units in diameter.
These two books have recently been reprinted by a new publisher and
Stirling wrote a 3rd title, _Lords of Creation_ to go with them. People
are exploring that sphere, but NONE of them appear to be aware
that a hollow sphere has no internal gravity force. They are all walking around in a 1 g field. In addition, it appears that people had been
snatched from Earth as recently as the later part of the 19th century
and had replicated that 19th century technology. I have my doubts that
there were enough people in the original party to have the necessary
total knowledge to do this.
On 8/22/2025 1:13 AM, Robert Woodward wrote:
Note: I decided to repost this since Freeman Dyson didn't postulate a
hollow shell, but a massive swarm of objects.
The short version: this book was a disappointment.
About 2 decades ago, Stirling wrote 2 books that modernized the mid 20th
century Planetary Romance genre (_The Sky People_ and _In the Courts of
the Crimson Kings_). Both Venus and Mars had been terraformed during the
Mesozoic by a highly advanced interstellar civilization and had been
seeded by life from Earth (with periodic inserts of more species,
including humans, up to about 5 thousand years ago for Venus and perhaps
200 hundred thousand years ago for Mars). The most advanced cultures on
Venus were Bronze age, but Mars had a uniform civilization with
extremely advanced bio-tech on a dying planet. In the epilog of _In the
Courts of the Crimson Kings_ some gates were opened that connected Venus
and Mars to other worlds, and Earth to a hollow sphere, 2 Astronomic
units in diameter.
These two books have recently been reprinted by a new publisher and
Stirling wrote a 3rd title, _Lords of Creation_ to go with them. People
are exploring that sphere, but NONE of them appear to be aware
that a hollow sphere has no internal gravity force. They are all walking
around in a 1 g field. In addition, it appears that people had been
snatched from Earth as recently as the later part of the 19th century
and had replicated that 19th century technology. I have my doubts that
there were enough people in the original party to have the necessary
total knowledge to do this.
I thought that Dyson Spheres had a star at the center of them for power ?
https://en.wikipedia.org/wiki/Dyson_sphere
"A Dyson sphere is a hypothetical megastructure that encompasses a star
and captures a large percentage of its power output.[1][2][3] The
concept is a thought experiment that attempts to imagine how a
spacefaring civilization would meet its energy requirements once those requirements exceed what can be generated from the home planet's
resources alone. Because only a tiny fraction of a star's energy
emissions reaches the surface of any orbiting planet, building
structures encircling a star would enable a civilization to harvest far
more energy."
That would certainly give off gravity.
On 8/22/2025 4:56 PM, Lynn McGuire wrote:
On 8/22/2025 1:13 AM, Robert Woodward wrote:
Note: I decided to repost this since Freeman Dyson didn't postulate a
hollow shell, but a massive swarm of objects.
The short version: this book was a disappointment.
About 2 decades ago, Stirling wrote 2 books that modernized the mid 20th >>> century Planetary Romance genre (_The Sky People_ and _In the Courts of
the Crimson Kings_). Both Venus and Mars had been terraformed during the >>> Mesozoic by a highly advanced interstellar civilization and had been
seeded by life from Earth (with periodic inserts of more species,
including humans, up to about 5 thousand years ago for Venus and perhaps >>> 200 hundred thousand years ago for Mars). The most advanced cultures on
Venus were Bronze age, but Mars had a uniform civilization with
extremely advanced bio-tech on a dying planet. In the epilog of _In the
Courts of the Crimson Kings_ some gates were opened that connected Venus >>> and Mars to other worlds, and Earth to a hollow sphere, 2 Astronomic
units in diameter.
These two books have recently been reprinted by a new publisher and
Stirling wrote a 3rd title, _Lords of Creation_ to go with them. People
are exploring that sphere, but NONE of them appear to be aware
that a hollow sphere has no internal gravity force. They are all walking >>> around in a 1 g field. In addition, it appears that people had been
snatched from Earth as recently as the later part of the 19th century
and had replicated that 19th century technology. I have my doubts that
there were enough people in the original party to have the necessary
total knowledge to do this.
I thought that Dyson Spheres had a star at the center of them for power ?
https://en.wikipedia.org/wiki/Dyson_sphere
"A Dyson sphere is a hypothetical megastructure that encompasses a star
and captures a large percentage of its power output.[1][2][3] The
concept is a thought experiment that attempts to imagine how a
spacefaring civilization would meet its energy requirements once those
requirements exceed what can be generated from the home planet's
resources alone. Because only a tiny fraction of a star's energy
emissions reaches the surface of any orbiting planet, building
structures encircling a star would enable a civilization to harvest far
more energy."
That would certainly give off gravity.
You'd fall toward the sun, in that case. Very, Very slowly.
If I trust the AI in my browser, the sun's gravity at 93 million
miles is about 1/1642 g.
On 8/22/2025 4:56 PM, Lynn McGuire wrote:
On 8/22/2025 1:13 AM, Robert Woodward wrote:
Note: I decided to repost this since Freeman Dyson didn't postulate a
hollow shell, but a massive swarm of objects.
The short version: this book was a disappointment.
About 2 decades ago, Stirling wrote 2 books that modernized the mid 20th >>> century Planetary Romance genre (_The Sky People_ and _In the Courts of
the Crimson Kings_). Both Venus and Mars had been terraformed during the >>> Mesozoic by a highly advanced interstellar civilization and had been
seeded by life from Earth (with periodic inserts of more species,
including humans, up to about 5 thousand years ago for Venus and perhaps >>> 200 hundred thousand years ago for Mars). The most advanced cultures on
Venus were Bronze age, but Mars had a uniform civilization with
extremely advanced bio-tech on a dying planet. In the epilog of _In the
Courts of the Crimson Kings_ some gates were opened that connected Venus >>> and Mars to other worlds, and Earth to a hollow sphere, 2 Astronomic
units in diameter.
These two books have recently been reprinted by a new publisher and
Stirling wrote a 3rd title, _Lords of Creation_ to go with them. People
are exploring that sphere, but NONE of them appear to be aware
that a hollow sphere has no internal gravity force. They are all walking >>> around in a 1 g field. In addition, it appears that people had been
snatched from Earth as recently as the later part of the 19th century
and had replicated that 19th century technology. I have my doubts that
there were enough people in the original party to have the necessary
total knowledge to do this.
I thought that Dyson Spheres had a star at the center of them for power ?
https://en.wikipedia.org/wiki/Dyson_sphere
"A Dyson sphere is a hypothetical megastructure that encompasses a
star and captures a large percentage of its power output.[1][2][3] The
concept is a thought experiment that attempts to imagine how a
spacefaring civilization would meet its energy requirements once those
requirements exceed what can be generated from the home planet's
resources alone. Because only a tiny fraction of a star's energy
emissions reaches the surface of any orbiting planet, building
structures encircling a star would enable a civilization to harvest
far more energy."
That would certainly give off gravity.
You'd fall toward the sun, in that case. Very, Very slowly.
If I trust the AI in my browser, the sun's gravity at 93 million
miles is about 1/1642 g.
pt
In article <robertaw-0A4722.23132121082025@news.individual.net>,
Robert Woodward <robertaw@drizzle.com> wrote:
Note: I decided to repost this since Freeman Dyson didn't postulate a >hollow shell, but a massive swarm of objects.
These two books have recently been reprinted by a new publisher and >Stirling wrote a 3rd title, _Lords of Creation_ to go with them. People >are exploring that sphere, but NONE of them appear to be aware
that a hollow sphere has no internal gravity force. They are all walking >around in a 1 g field.
This is a recurring issue in Dyson shell SF. Authors want the characters
in illuminated landscapes, thus the inner shell.
In article <kcnjaklunepcpb4fac4ld94p65f7so2813@4ax.com>,So I have read here and elsewhere. I do not doubt it.
Paul S Person <psperson@old.netcom.invalid> wrote:
On Fri, 22 Aug 2025 20:33:23 -0400, Cryptoengineer
<petertrei@gmail.com> wrote:
<snippo Dyson Sphere stuff>
If I trust the AI in my browser, the sun's gravity at 93 million
miles is about 1/1642 g.
Trust an AI? <ROTFL>
Did I tell you about the AI in my browser? When asked if the two parts
of a doorknob lock (one with the lock in the knob, the other with a >>turnable thing to lock it on the inside) was recyclable it said "yes, >>provided it is empty and clean".
IOW, it thought I was talking about a bottle or a jar.
So much for the "I" in "AI".
It didn't think. It strung together words that fit a pattern.
On Sat, 23 Aug 2025 16:07:31 -0000 (UTC), jdnicoll@panix.com (James
Nicoll) wrote:
In article <kcnjaklunepcpb4fac4ld94p65f7so2813@4ax.com>,
Paul S Person <psperson@old.netcom.invalid> wrote:
On Fri, 22 Aug 2025 20:33:23 -0400, Cryptoengineer
<petertrei@gmail.com> wrote:
<snippo Dyson Sphere stuff>
If I trust the AI in my browser, the sun's gravity at 93 million
miles is about 1/1642 g.
Trust an AI? <ROTFL>
Did I tell you about the AI in my browser? When asked if the two parts
of a doorknob lock (one with the lock in the knob, the other with a >>>turnable thing to lock it on the inside) was recyclable it said "yes, >>>provided it is empty and clean".
IOW, it thought I was talking about a bottle or a jar.
So much for the "I" in "AI".
It didn't think. It strung together words that fit a pattern.
So I have read here and elsewhere. I do not doubt it.
But how does this improve the situation?
Why should we give /any/ credence to something that just strings
together words?
On 8/22/2025 1:13 AM, Robert Woodward wrote:
Note: I decided to repost this since Freeman Dyson didn't postulate a
hollow shell, but a massive swarm of objects.
The short version: this book was a disappointment.
About 2 decades ago, Stirling wrote 2 books that modernized the mid 20th
century Planetary Romance genre (_The Sky People_ and _In the Courts of
the Crimson Kings_). Both Venus and Mars had been terraformed during the
Mesozoic by a highly advanced interstellar civilization and had been
seeded by life from Earth (with periodic inserts of more species,
including humans, up to about 5 thousand years ago for Venus and perhaps
200 hundred thousand years ago for Mars). The most advanced cultures on
Venus were Bronze age, but Mars had a uniform civilization with
extremely advanced bio-tech on a dying planet. In the epilog of _In the
Courts of the Crimson Kings_ some gates were opened that connected Venus
and Mars to other worlds, and Earth to a hollow sphere, 2 Astronomic
units in diameter.
These two books have recently been reprinted by a new publisher and
Stirling wrote a 3rd title, _Lords of Creation_ to go with them. People
are exploring that sphere, but NONE of them appear to be aware
that a hollow sphere has no internal gravity force. They are all walking
around in a 1 g field. In addition, it appears that people had been
snatched from Earth as recently as the later part of the 19th century
and had replicated that 19th century technology. I have my doubts that
there were enough people in the original party to have the necessary
total knowledge to do this.
I thought that Dyson Spheres had a star at the center of them for power ?
https://en.wikipedia.org/wiki/Dyson_sphere
"A Dyson sphere is a hypothetical megastructure that encompasses a star
and captures a large percentage of its power output.[1][2][3] The
concept is a thought experiment that attempts to imagine how a
spacefaring civilization would meet its energy requirements once those requirements exceed what can be generated from the home planet's
resources alone. Because only a tiny fraction of a star's energy
emissions reaches the surface of any orbiting planet, building
structures encircling a star would enable a civilization to harvest far
more energy."
That would certainly give off gravity.