dangermows
Striker
I remember a programme on that. The normal state of events is that the gas giants are closest to the star. It was almost a comedy of errors that led to our Goldilocks planet.
Yep. Jupiter was on the way in towards the Sun, on an absolutely rampage, and would've got shot of all the rocks which allowed the Earth to form in the way it did. But Saturn was born, and pulled Jupiter back just as it was about to clatter Mars.