Jupiter’s diameter is 11 times that of earth’s and its mass is 317 times that of the earth. How did it go from being an earth-sized planet to being a gas giant? I don’t think swallowing asteroids would account for that.
I don’t think swallowing asteroids would account for that.
What I’m don’t understand is, if Hot Jupiters are the norm, and Jupiter presently is too far out to be ‘hot,’ did it migrate in and then stop? Why would it stop?
Maybe, and I’d have to run some simulations to determine, maybe Jupiter slowed down to gawk at the collision of whatever it was that knocked Uranus on its ass. By not paying attention to where it was going, Jupiter then slammed into ‘traffic cone’ planetesimals , leaving behind the asteroid belt and some hub caps.