Mike Brown's Planets, season 4: sabbatical |
Mike Brown's Planets, season 4: sabbatical |
Oct 29 2010, 11:59 AM
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Now on sabbatical, Mike Brown has recently reactivated his mainly Transneptunian blog. Here is a tasty two-parter on Sedna for starters: http://www.mikebrownsplanets.com/2010/10/t...ere-part-2.html
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Dec 13 2013, 02:37 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Rather simplified simulations I've done a long time ago (unpublished) showed, that randomly started planetary systems behave highly chaotic in the beginning, including planets being ejected from the system or planets falling into the sun. That's because each close encounter leads to an exchange of kinetic energy throwing one planet further out, and the other closer to the sun, including highly elliptical orbits.
Therefore tracking back the solar system becomes more and more uncertain the further you go back to the past. This means two things: Similar initial conditions can lead to very different results, and rather different initial conditions may lead to similar results. The underlying general principle is deterministic chaos, rather abundant among non-linear dynamical systems. So, if you like extra ice giants in the early solar system, you'll find a way to define initial conditions which make them vanish later. If you like to try your own implementation, here is an intro. |
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