Talk:Planetary migration
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Migration of gravitational scattering?[edit]
One of the most cited sources in Wikipedia (not only in this article) for the probable outward migation of Uranus and Neptune is the paper from Thommes, Duncan and Levison (2002). However, they do not describe a continuous migration due to planet-disk interactions but a gravitational scattering by Jupiter and Saturn. Please make sure which type of migration is meant.--SiriusB (talk) 10:46, 7 November 2008 (UTC)
Is the Planetary Migration of Neptune still going on?[edit]
Something I've never seen convincingly answered - is Neptune still on a course of planetary migration out into the Kuiper Belt? And is this why not all objects in the Kuiper Belt are yet in resonant orbits with Neptune? 100 million or 200 million years ago where was Neptune's orbit? Where will it be in 100 or 200 million years? Has it moved over the last few hundred million years, and if so, isn't it then still obviously on an outward trajectory through the Kuiper Belt? Has anyone established where Neptune's equilibrium point in relation to the Sun really is? Is it there yet? How far out is this "equilibrium" point - all other things being equal.
These are not to my mind questions that have been suitably answered or discussed - what is the consensus on Neptune's current planetary migration status?202.139.104.226 (talk) 13:51, 15 November 2008 (UTC)
Indiscriminate oligarchy[edit]
The text uses the terms indiscriminately:
- oligarchs are not planetesimals, but composed of some 10 planetesimals, a planetesimal is some 1-1000 km in diameter – the oligarchs resulted from an oligarchic growth where former planetesimals added lots of planetesimals to its mass; an oligarch was up to Mars sized or so;
- the place where one usually speaks of oligarchic growth was in the inner solar system – the growth made the oligarch bodies monopolize the mass accretion by scattering the orbits of remaining planetesimals, so that "competitor" planets couldn't emerge, some 20-30 oligarchs emerged in the inner solar system, all before the final terrestrial planets. Other kinds of accretions wasn't necessarily "oligarchic" in that way.