What happens is, because lets say you want to go to Jupiter, because its a far distance away. You cant bring all the fuel you need to get to Jupiter in a straight line. That would need a massive rocket.
So instead what you do is, you wait until Mars comes along our path.
Because Mars is so much bigger than the rocket. You can use Mars to catapult you towards Jupiter like a slingshot.
The problem is. Over the course of billions of years. Our solar system was a mess. Planets going in all kinds of directions and moving all over the place.
We are the remaining survivors of that planet war that made it out alive of all the collisions that took place during that time, and the vertical disk spinning in the same direction was the winner.
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