Geology of Meteorites Reveal Jupiter as Firstborn Planet

Discussion in 'Astronomy, Exobiology, & Cosmology' started by danshawen, Jun 13, 2017.

  1. danshawen Valued Senior Member

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    https://www.washingtonpost.com/news...cient-meteorites-show/?utm_term=.4c557132236e

    A study which divides specific chemistries of meterorite finds into ages reveals that 4.6 billion year old Jupiter was likely the firstborn planet of our solar system, and that it scooped up most of the lighter and mid density debris from the disc of the early inner solar system, leaving rocks and metals and heavier atmospheres to the planets that formed later.

    The asteroid belt between Mars and Jupiter are remnants of that process.

    It was also speculated that Jupiter, 300 time the mass of the Earth, is likely the reason that no "super" massive versions of Earth remained orbiting in the habitable region of our own solar system.

    We can only hope that its planetary status won't someday be upgraded to "failed star", cutting our tally back to eight planets, as it was for a lost decade:

    https://futurism.com/pluto-reclassified-as-a-major-planet/
     
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  3. danshawen Valued Senior Member

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    This is some first rate science, sorting meteorites that landed on Earth into epochs that seem to be correlated to before and after Jupiter scooped up materials from the inner solar system.

    Obviously, the Earth had to be fully formed before the first meteorites from that process landed, so normal strata dating of such objects would have been impossible.

    Really, no skepticism at all on the new idea of sorting them by means of chemistry? Arguments abounded over silly things like the Earth orbiting the Sun, or being flat or round, carried on the backs of gargantuan turtles, the fossil record, carbon or potassium dating, but no problem at all with dating epochs of meteorites based on an idea that Jupiter formed in the inner solar system 4.6 billion years ago? How come? Because the book of Genesis doesn't say anything at all along the lines of "Let there be a failed star named for a mythical Roman God"? Memories too short to remember what the Romans did? Too many Romans who themselves are now a part of the fossil record? What?

    Iron forms later in the life of a star like our Sun. Any shortage of iron here? Nope. If not, our civilization would never have made it to the Iron Age, another epoch commemorated in a particular stratification of the fossil record.

    Good one.

    What about the basic kinematics then? Jupiter scooped up debris and materials orbiting closer to the Sun than Jupiter does now. Doesn't that violate conservation of angular momentum? How did Jupiter get to its present distant orbit, if everything it scooped up originally orbited much closer to the Sun? How did Jupiter pick up speed as it went? Did it eject something along the way, or did it collect some large former planet with a much more eccentric orbit? The number of moons it has now might be a clue. Why not sort its moons into epochs, like we just did to our meteorites?

    And why does Jupiter itself spin so fast? A Jovian day is about 10 Earth hours, isn't it?
     
    Last edited: Jun 14, 2017
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  5. RADII Registered Member

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    The reigning theor[ies] for the positions of the Jovians is predicated on a radial migration outward from the central star. This also requires Jupiter & Saturn to have formed early & fallen into a resonance that fed the migration.

    "Our group has recently proposed two models that aim to reconstruct two different phases of the evolution of the solar system: one that was dominated by the gas disk and one that occurred after
    the disappearance of the gas. The first model specifically addresses the migration of Jupiter and Saturn in the protoplanetary gas disk. If considered individually, these planets should have evolved toward the Sun as the result of type II migration. However, Masset & Snellgrove (2001, hereafter MS01) showed that Saturn tends to get locked in a 2:3 mean-motion resonance (MMR) with Jupiter. In this configuration, the gaps opened in the disk by the two planets can overlap with each other. This can lead to a reversal of the migration direction. This mechanism has more recently been studied in greater
    detail by Morbidelli & Crida (2007, hereafter MC07)."

    [DYNAMICS OF THE GIANT PLANETS OF THE SOLAR SYSTEM IN THE GASEOUS PROTOPLANETARY
    DISK AND THEIR RELATIONSHIP TO THE CURRENT ORBITAL ARCHITECTURE
    Alessandro Morbidelli
    Observatoire de la Coˆte d’Azur, B.P. 4229, 06304 Nice Cedex 4, France; morby@obs-nice.fr
    Kleomenis Tsiganis
    Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
    Aure´lien Crida
    Department of Physics, University of Tu¨bingen, Tu¨bingen, Germany
    Harold F. Levison
    Southwest Research Institute, Boulder, CO 80302, USA
    and
    Rodney Gomes
    National Observatory, Rio de Janeiro, Brazil
    Received 2007 June 6; accepted 2007 July 16]
     
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