'Jupiter' and 'Saturn', a Friend of Mars

Jupiter probably slowed down, and that's what caused denn to get pulled in. For j Jupiter to go back out again, what is required for that? Does it have to start speeding up? And then also, can it get nudged? Why did it leave? Well jupiter, we think, probably was saved by its friend saturn, because saturn has the same fate. Writes Saturn, also a big gas giant, also probably surrounded by big, swarming clouds of gas,. getting slowed down, drifting in towards the inner solar system.