I think you’re underestimating the amount of energy contained within the Earth. We’re not going to “let the heat out”. Just like every gravity assist steals en

I think you’re underestimating the amount of energy contained within the Earth. We’re not going to “let the heat out”. Just like every gravity assist steals energy from the planet and gives it to the spacecraft. We’ve actually slowed down Jupiter… by a tiny, tiny amount. But still probably less than some random asteroid does all the time.