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TLDR: it isn't.

For a real explanation : http://en.wikipedia.org/wiki/Three-body_problem

It's a typical chaotic system. Over the short term everything looks and behaves VERY stable, but every 10 million years or so things align juuuuust right and some major shift suddenly happens.



> but every 10 million years or so things align juuuuust right and some major shift suddenly happens.

I haven't thought deeply, but a quick check of the Sun-Moon-Earth system seems to disagree with this.


Actually you're wrong and should probably read the article.




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