From Newsgroup: rec.arts.sf.written

So, the majority of earlier Science Fiction authors had engaged
in a pretty basic group think. They figured Sol, and Earth,
were unexceptional. There must be plenty of places very similar
to our home around the universe.

read it all at: https://www.space.com/astronomy/exoplanets/trappist-1d-isnt-the-earth-like-planet-scientists-had-hoped-it-to-be-according-to-jwst-data

TRAPPIST-1d isn't the Earth-like planet scientists had hoped it to be, according to JWST data
News
By Keith Cooper published 23 hours ago
"At this point, we can rule out TRAPPIST-1d from a list of potential
Earth twins or cousins."

There's bad news for our hopes of habitable planets existing around TRAPPIST-1, with the James Webb Space Telescope (JWST) finding no
evidence for an Earth-like atmosphere on a third world orbiting the red
dwarf.

However, that still leaves four other planets in orbit around TRAPPIST-1
that could be habitable, with at least two or three of them in what is regarded as the "habitable zone" where temperatures would be suitable
for liquid water to exist rCo- assuming an Earth-like atmosphere that can retain heat. ----




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From Newsgroup: rec.arts.sf.written

I don't think that a single exoplanet found to date is really very
Earthlike.
Since big planets are the easiest to detect, though, the fact that
although all the gas giants in our Solar System are far from the Sun and
cold, the most common type of exoplanet seems to be a gas giant that is
very close to its parent star and quite hot... should not be too
surprising.
But this at least suggests that perhaps Jupiter is a) unusual, and b) in
some way responsible for the very existence of Earth the way it is.

John Savard
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From Newsgroup: rec.arts.sf.written

On 8/26/2025 1:13 AM, John Savard wrote:

I don't think that a single exoplanet found to date is really very
Earthlike.
Since big planets are the easiest to detect, though, the fact that
although all the gas giants in our Solar System are far from the Sun and cold, the most common type of exoplanet seems to be a gas giant that is
very close to its parent star and quite hot... should not be too
surprising.
But this at least suggests that perhaps Jupiter is a) unusual, and b) in
some way responsible for the very existence of Earth the way it is.

John Savard

According to the Grand Tack hypothesis, Jupiter first migrated inward,
causing collisions that destroyed nascent inner planets, and then
migrated back out, its immense gravity clearing much of the remaining
material and leaving the stable inner solar system where Earth could
form and thrive.
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From Newsgroup: rec.arts.sf.written



On 8/25/25 23:13, John Savard wrote:

I don't think that a single exoplanet found to date is really very
Earthlike.
Since big planets are the easiest to detect, though, the fact that
although all the gas giants in our Solar System are far from the Sun and cold, the most common type of exoplanet seems to be a gas giant that is
very close to its parent star and quite hot... should not be too
surprising.
But this at least suggests that perhaps Jupiter is a) unusual, and b) in
some way responsible for the very existence of Earth the way it is.

John Savard

Got to agree with you John but before planetoid whichever collided
with the Earth and knocked off the Moon the Earth was not very earthlike
and had some characteristics of some discoveed planets slightly larger than
our Earth.

Some people believe that this impact allowed certain forms of micro- bacterial life to thrive and that with the Moon now influencing the tides
that gave some additional stimulus for the eventual emergenc of Life on
Land. There is at least onw PBS show that makes reference to the wide
swings in habitability on Planet Earth from snowball to greenhouse with
violent vulcanism which disrupted habitats repeated forcing the evolution
of intelligence.

Nearly every surviving species is intelligent but only mankind has
a very large brain, communication across time and space, and hands
which are very handy for domestication of other animals.

Even the cockroaches know to run when I turn on the lights in
the kitchen and if they are too dumb to run they are squashed. I am
breeding more intelligent roaches with this approach as the more
intelligent know to run away when the light is on so that they survive
to breed. We have to get them ready for our extinction so that
roaches can rule the world after mankind. From an old 1940s
Amazing SF story.

bliss
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