Astronomy

[Odin]

(06-10-2016, 04:20 PM)radind Wrote: Recent analysis on  history of our solar system.

How the sun abducted dwarf planets from an alien solar system

https://www.newscientist.com/article/mg2...ar-system/
The weird orbits of some bodies in the outer solar system reveal they are booty from an interstellar smash and grab raid, says astronomer Simon Portegies Zwart

… “not in the Kuiper belt or the Oort cloud, but in that mysterious gap between the two. The long-period comets are evidence that the orbits of smaller bodies in the Oort cloud are not static….Typically perturbed by the outermost giant planets, Uranus and Neptune, they adopt inclined, highly elliptical – “eccentric” – orbits that tend to end up in sync with the giants’ orbits.”…“Mike Brown of the California Institute of Technology in Pasadena and his team discovered the dwarf planet Sedna. …Sedna’s orbit is curious … It is very elongated”….

… “What emerges is a close brush between our solar system and that of a star almost twice as massive as the sun.  …For smaller bodies,the jolt was felt as far in as about 40 AU, ripping out any planetesimals beyond that point into interstellar space – in other words, producing the Kuiper cliff (Monthly Notices of the Royal Astronomical Society, vol 453, p 3157).”…"Apart from having reshaped the solar system’s outer regions, the simulations show that more than 2000 planetesimals orbiting the other star would have become bound to the young sun,”…about half ending up in orbits similar to that of Sedna.”…

Paywall, again.