From Newsgroup: alt.fan.heinlein

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

Plate Tectonics Might Only Occur on 0.003% of Planets. That Makes Earth
Very Special Indeed.
Plate tectonics, oceans, and continents might just be the secret
ingredients for complex life on Earth. And if these geological features
are rare elsewhere in the universe, then perhaps that explains why we havenrCOt yet discovered intelligent alien life. New research from
American and Swiss Earth scientists suggests that these ingredients
represent missing variables in the famous Drake equation, devised more
than half a century ago to estimate the chances of finding advanced civilizations in our galaxy. Including these new variables could
completely rewrite the probability of detecting intelligent life in the
Milky Way.

Go to the citation for the rest ----.
--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

Plate Tectonics Might Only Occur on 0.003% of Planets. That Makes Earth
Very Special Indeed.
Plate tectonics, oceans, and continents might just be the secret
ingredients for complex life on Earth. And if these geological features
are rare elsewhere in the universe, then perhaps that explains why we havenrCOt yet discovered intelligent alien life. New research from
American and Swiss Earth scientists suggests that these ingredients represent missing variables in the famous Drake equation, devised more
than half a century ago to estimate the chances of finding advanced civilizations in our galaxy. Including these new variables could
completely rewrite the probability of detecting intelligent life in the Milky Way.

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.
--
I've done good in this world. Now I'm tired and just want to be a cranky
dirty old man.

--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information. Hopefully we will see a lot more on this research in the future.


--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information. Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions. If you have a
rocky planet with a liquid core/mantle, you are going to have plate
tectonics.
--
I've done good in this world. Now I'm tired and just want to be a cranky
dirty old man.

--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On Thu, 4 Jul 2024 09:54:50 -0700, a425couple <a425couple@hotmail.com>
wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from >https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

Plate Tectonics Might Only Occur on 0.003% of Planets. That Makes Earth
Very Special Indeed.
Plate tectonics, oceans, and continents might just be the secret
ingredients for complex life on Earth. And if these geological features
are rare elsewhere in the universe, then perhaps that explains why we >havenAt yet discovered intelligent alien life. New research from
American and Swiss Earth scientists suggests that these ingredients >represent missing variables in the famous Drake equation, devised more
than half a century ago to estimate the chances of finding advanced >civilizations in our galaxy. Including these new variables could
completely rewrite the probability of detecting intelligent life in the >Milky Way.

Go to the citation for the rest ----.

Note the sequence here:
1. Certain people believe -- firmly, passionately, and religiously
believe -- that We Are Not Alone. This /must/ be true, they say, it
just /must/ be true.
2. The problem is, no actual evidence of this has been found.
3. Indeed, no actual evidence is likely to be found until we /go out
into the universe and see/.
4. Since the radio frequencies /we have decided/ are the ones that
would be used to communicate with us are silent, they are desperate
for excuses. They, of course, call them "explanations".
5. Lack of Plate Tectonics is simply the latest excuse.
What I /wouldn't/ find if I bothered to read the article:
a detailed discussion of, say, 500 planets (or even of 1 extrasolar
planet) which we have travelled to and investigated thoroughly and how
many of them had plate tectonics, a large natural satellite, an
absence of Dark Matter, archaeological evidence of past (and now gone)
Alien Civilizations, or any of the other excuses that have been
offered.
I wouldn't find that because the only planets we have visited are in
our own Solar System -- and, even so, we haven't actually explored
them enough to know for certain that a past civilization did not
exist. All we can say is that /by the criteria we decided on
ourselves, which may or may not be adequate/ there isn't any life on
any of them. At least, not any that we have found to date.
--
"Here lies the Tuscan poet Aretino,
Who evil spoke of everyone but God,
Giving as his excuse, 'I never knew him.'"
--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/4/2024 10:25 PM, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information.
Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.-a If you have a rocky planet with a liquid core/mantle, you are going to have plate tectonics.

Venus, Mars, and Mercury suggest otherwise.

My impression is that the existance of a (relatively shallow)
water ocean is critical. There's also a suggestion that a major
meteor impact may have been involved in starting the process.

pt



--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/4/24 19:25, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information.
Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.-a If you have a rocky planet with a liquid core/mantle, you are going to have plate tectonics.

resending----

Ahhh,,,, ??
I do not know about that. Needs to get more detailed.
Take Mars, the closest and most explored example.
It has pretty much lost internal movement,
thus magnetic waves that protect it from
solar waves, and the solar wind has wiped off
most atmosphere, and water.

Question Does Mars have plate tectonics?

Mars, it seems, once had active tectonic plates spreading away from
long, narrow volcanic rifts, according to two reports in tomorrow's
Science (pp.
https://www.science.org rC| content rC| article rC| past-tecton...
Past Tectonics on Mars? | Science | AAAS

Why doesn't Mars have plate tectonics?
Shaping the Planets: Tectonism
Like Earth, Venus and Mars are believed to have hot interiors. This
means that they are continuing to lose heat. While their surfaces show evidence of recent deformation rCo tectonism rCo neither planet has plate tectonic activity because neither planet has a surface divided into plates.

Shaping the Planets: Tectonism - Lunar and Planetary Institute
Lunar and Planetary Institute

What planets have plate tectonics?

Why Earth is the only planet with plate tectonics - Big Think
Here in our Solar System, of all the known planets, only Earth rCo not Mercury, not Venus, and not Mars rCo is known to possess plate
tectonics.Mar 27, 2023

How Mars Lost Its Magnetic FieldrCoand Then Its Oceans - JSTOR Daily
JSTOR Daily
https://daily.jstor.org rC| how-mars-lost-its-magnetic-field-...
Search for: Why did Mars lose its magnetic field?

--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/4/24 09:54, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Or, in summary

rCLTwo possibilities exist: either we are alone in the Universe
or we are not. Both are equally terrifying.rCY
rCo Arthur C. Clarke

--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/5/2024 11:00 AM, Cryptoengineer wrote:

On 7/4/2024 10:25 PM, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information.
Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.-a If you have a
rocky planet with a liquid core/mantle, you are going to have plate
tectonics.

Venus, Mars, and Mercury suggest otherwise.

I believe Mars and Mercury's cores have solidified. Venus has ... other issues but does have active vulcanism. And considering how many it has
may make up for the locked crustal plates.

My impression is that the existance of a (relatively shallow)
water ocean is critical. There's also a suggestion that a major
meteor impact may have been involved in starting the process.

Theia was a bit more than a meteor and yes, liquefying the entire planet
a second time might have an effect.
--
I've done good in this world. Now I'm tired and just want to be a cranky
dirty old man.

--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 05/07/2024 19.57, Dimensional Traveler wrote:

On 7/5/2024 11:00 AM, Cryptoengineer wrote:

On 7/4/2024 10:25 PM, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information. >>>> Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.-a If you have a rocky planet with a liquid core/mantle, you are going to have plate tectonics.

Venus, Mars, and Mercury suggest otherwise.

I believe Mars and Mercury's cores have solidified.

I thought that, as well. It appears that, for Mars at least, that's an
obsolete idea: <https://www.scientificamerican.com/article/mars-has-a-surprise-layer-of-molten-rock-inside/>
--
Michael F. Stemper
If it isn't running programs and it isn't fusing atoms, it's just bending space.

--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/4/2024 10:25 PM, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information.
Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.-a If you have a rocky planet with a liquid core/mantle, you are going to have plate tectonics.

Neither Mercury, Venus, nor Mars have plate tectonics. That's 3/4
of the rocky planets with a liquid core/mantel, that we know about.

pt


--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/6/2024 12:36 PM, Cryptoengineer wrote:

On 7/4/2024 10:25 PM, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information.
Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.-a If you have a
rocky planet with a liquid core/mantle, you are going to have plate
tectonics.

Neither Mercury, Venus, nor Mars have plate tectonics. That's 3/4
of the rocky planets with a liquid core/mantel, that we know about.

Bizzare. Thunderbird (or Eternal-September) is messing up. I didn't mean
to duplicate the post, but I put up the same info yesterday, but didn't
see it the first time I opened TB today, so reposted.

pt

--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On 7/5/2024 8:57 PM, Dimensional Traveler wrote:

On 7/5/2024 11:00 AM, Cryptoengineer wrote:

On 7/4/2024 10:25 PM, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information. >>>> Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.-a If you have
a rocky planet with a liquid core/mantle, you are going to have plate
tectonics.

Venus, Mars, and Mercury suggest otherwise.

I believe Mars and Mercury's cores have solidified.-a Venus has ... other issues but does have active vulcanism.-a And considering how many it has
may make up for the locked crustal plates.

If you trust wikipedia, all 3 that liquid cores. I was a little
suprised myself.

My impression is that the existance of a (relatively shallow)
water ocean is critical. There's also a suggestion that a major
meteor impact may have been involved in starting the process.

Theia was a bit more than a meteor and yes, liquefying the entire planet
a second time might have an effect.

Wasn't thinking of Theia, but something much later, which still make a
big enough hole in the early crust that subduction got kickstarted, then spread.

pt

--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

On Sat, 6 Jul 2024 13:37:04 -0400, Cryptoengineer
<petertrei@gmail.com> wrote:

On 7/6/2024 12:36 PM, Cryptoengineer wrote:

On 7/4/2024 10:25 PM, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information. >>>> Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.a If you have a
rocky planet with a liquid core/mantle, you are going to have plate
tectonics.

Neither Mercury, Venus, nor Mars have plate tectonics. That's 3/4
of the rocky planets with a liquid core/mantel, that we know about.

Bizzare. Thunderbird (or Eternal-September) is messing up. I didn't mean
to duplicate the post, but I put up the same info yesterday, but didn't
see it the first time I opened TB today, so reposted.

I don't seem to have that problem with Agent 8 and Eternal September,
so perhaps Thunderbird needs investigation.
--
"Here lies the Tuscan poet Aretino,
Who evil spoke of everyone but God,
Giving as his excuse, 'I never knew him.'"
--- Synchronet 3.21d-Linux NewsLink 1.2

From Newsgroup: alt.fan.heinlein

Le 2024-07-05 |a 16:40, a425couple a |-crit-a:

On 7/4/24 19:25, Dimensional Traveler wrote:

On 7/4/2024 4:49 PM, a425couple wrote:

On 7/4/24 12:33, Dimensional Traveler wrote:

On 7/4/2024 9:54 AM, a425couple wrote:

Big DEAL !!
So many times greats like Heinlein and Silverberg have written
about us going to exoplanets, and it being like Earth.
Sorry,,,, NO!

from
https://www.universetoday.com/167659/plate-tectonics-might-only-occur-on-0-003-of-planets-that-makes-earth-very-special-indeed/

Plate tectonics: Image Credit: NASA/Goddard Space Flight Center
Scientific Visualization Studio
POSTED ONJULY 2, 2024 BY SCOTT ALAN JOHNSTON

-----------snip-------

Go to the citation for the rest ----.

I went to the citation but couldn't find if that 0.003% is of ALL
exo-planets or just the Terrestrial/Super-Terrestrial types.

"the rest" of the citation, did not give a lot of specific information.
Hopefully we will see a lot more on this research in the future.

I also think there's a flaw in their basic assumptions.-a If you have a
rocky planet with a liquid core/mantle, you are going to have plate
tectonics.

resending----

Ahhh,,,, ??
I do not know about that.-a Needs to get more detailed.
Take Mars, the closest and most explored example.
It has pretty much lost internal movement,
thus magnetic waves that protect it from
solar waves, and the solar wind has wiped off
most atmosphere, and water.

Question Does Mars have plate tectonics?

Mars, it seems, once had active tectonic plates spreading away from
long, narrow volcanic rifts, according to two reports in tomorrow's
Science (pp.
https://www.science.org rC| content rC| article rC| past-tecton...
Past Tectonics on Mars? | Science | AAAS

Why doesn't Mars have plate tectonics?
Shaping the Planets: Tectonism
Like Earth, Venus and Mars are believed to have hot interiors. This
means that they are continuing to lose heat. While their surfaces show evidence of recent deformation rCo tectonism rCo neither planet has plate tectonic activity because neither planet has a surface divided into plates.

Shaping the Planets: Tectonism - Lunar and Planetary Institute
Lunar and Planetary Institute

What planets have plate tectonics?

Why Earth is the only planet with plate tectonics - Big Think
Here in our Solar System, of all the known planets, only Earth rCo not Mercury, not Venus, and not Mars rCo is known to possess plate
tectonics.Mar 27, 2023

How Mars Lost Its Magnetic FieldrCoand Then Its Oceans - JSTOR Daily
JSTOR Daily
https://daily.jstor.org rC| how-mars-lost-its-magnetic-field-...
Search for: Why did Mars lose its magnetic field?

Mars have about the same average density as the Earth, BUT, the radius
of Mars is about 0.6 Earth radius.
That mean about 0.216 Earth mass and about 0.36 of the surface. This
resulted in a much faster cooling. It should be noted that the initial temperature of the inside of Mars was probably lower as it accumulated
less energy during it's accretion. That also mean a lot less heat from
nuclear decay. So, it's interior cooled, causing the core to become
thick, thus stopping the magnetic field generating process.
The loss of it's magnetic field only accelerated the loss of it's
atmosphere. Remember that the Martian escape velocity is about a third
of Earth's escape velocity. That alone mean loosing it's atmosphere.

For Earth, we now have reasons to think that plate tectonics got
initiated by the collision that formed the Moon. Then, the tidal pull
from the Moon may have helped kipping it running.
Venus seems to never experience such a collision, so, nothing to kick
start it's plate tectonics. The Venusian crust it possibly thinner than Earth's crust, as the insulation provided by it's very thick atmosphere
must slow down it's cooling.

There is a model where Mercury would be the core of an Uranus like
planet that evaporated due to it's proximity to the Sun.
--- Synchronet 3.21d-Linux NewsLink 1.2