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  • TRAPPIST-1d isn't the Earth-like planet scientists had hoped

    From a425couple@21:1/5 to All on Fri Aug 15 10:16:22 2025
    XPost: alt.astronomy, rec.aviation.military, alt.fan.heinlein

    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 —- assuming an Earth-like atmosphere that can retain heat. ----

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  • From John Savard@21:1/5 to All on Tue Aug 26 06:13:31 2025
    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 Jay Morris@21:1/5 to John Savard on Tue Aug 26 13:01:01 2025
    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 Bobbie Sellers@21:1/5 to John Savard on Tue Aug 26 11:54:31 2025
    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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