I am a staunch believer in leading with the bad news, so let me get straight to the point. Earth, our anchor and our solitary haven in a hostile universe, is in a precarious situation. The solar system around us is rife with instability.
The Madness of the Planets
The enlightenment idea of the divine clockwork of the cosmos is largely a lie. Our solar system was born out of chaos and despite our relatively predictable recent past, to chaos it will eventually return.
In addition, an excellent youtube video explaining the idea of orbits with marbles and spandex:
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