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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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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* Origin: A noiseless patient Spider (3:633/280.2@fidonet)

Reply-To: blissInSanFrancisco@mouse-potato.com



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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