Robert Zimmerman is casting much doubt on various simulations of our own Solar System.
We’re decent at proxies for past temperature and, say, how long our own day was, since the “boring billion” 1800-800 Mya. For two billion years our Earth hasn’t budged much from 1 AU. Mars is well-enough explored by now, we know that it hasn’t Velikovsky’d, either, since like 3500 Mya. I expect similar for Vesta. And for Jupiter and its moons. Dynamics work best for systems in deep resonance - they almost certainly formed like that.
Problem with deep resonance is that they are seen, from here, when they are very close to their star. Our system is not (much) in resonance. What happens past 6 AU? Saturn’s system is a problem and it’s exactly the outer planets as would be most-affected by a Gliese 710 in our past.
Edward Lorenz did his chaos-theory papers in the 1960s. Our computers have improved. Our ability to predict chaotic systems has also improved. But given all these unknowns...
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