[SunkenCiv]

IOW, our Solar System likely has (or had) planets in retrograde. General search on planets:

Google

[SunkenCiv]

http://www.physorg.com/news10890.html
http://www.spaceref.com/news/viewpr.html?pid=18998
http://www.universetoday.com/am/publish/backwards_planets.html?1522006
http://www.santacruzsentinel.com/archive/2006/January/23/local/stories/03local.htm

[son of caesar]

Maybe this applies? For every action there is an equal and opposite reaction.

[AndrewC]

"This is the first time anyone has seen anything like this, and it means that the process of forming planets from such disks is more complex than we previously expected,"

Duh, do ya think so?

[SunkenCiv]

related:

Spitzer Sees the Aftermath of a Planetary Collision
Universe Today | Jan. 10, 2005 | Dolores Beasley and Gay Yee Hill
Posted on 01/13/2005 11:50:18 PM EST by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1320521/posts

NASA's Spitzer Finds Violent Galaxies Smothered In 'Crushed Glass'
NASA/Jet Propulsion Laboratory via ScienceDaily.com | February 17, 2006 | NA
Posted on 02/20/2006 2:50:42 AM EST by neverdem
http://www.freerepublic.com/focus/f-chat/1582020/posts

The next post will have a relevant search link -- jumbo extrasolar planets have been spotted (indirectly) in orbit so close to the parent star that they must have been captured, or spiralled slowly inward due to retrograde orbits, or are newly born as chunks of the stars.

[SunkenCiv]

Extrasolar Planets: A Matter of Metallicity
Space Daily, SPX | Oct 12, 2004 | Henry Bortman
Posted on 10/12/2004 3:52:50 PM EDT by tricky_k_1972
http://www.freerepublic.com/focus/f-news/1242941/posts

[SunkenCiv]

from February 2006:

X-Planets FR 'blog

[garbageseeker]

Maybe something catastrophic happened early in the formation of the star's solar system to have those disks orbiting in different directions

[garbageseeker]

Maybe a passage of a star changed its orbits. We know when star's get close to objects it changes it orbits. Maybe a local supernova explosion changed the gravitational orbits.