how big are the gas planets rocky inners in our solar system?

Answer 1

Jupiter has a liquid surface at the center is liquid hydrogen (as a liquid hydrogen acts like a metal 1S element remember - and the rapid spin of jupiter accounts for the extremely fascinating electrical fields generated by Jupiter), it is surrounded by liquid helium.

There is no rock on Jupiter - Saturn - maybe, the outers likely.

Answer 2

I don't know what those others are talking about when they say the Jovian planets don't have rocky/metallic cores, since they do! Actually, with Jupiter and Saturn, the cores are made of rock, metal, and hydrogen compounds. With Uranus and Neptune, the cores consist of rock and metals, which is then surrounded by a layer of hydrogen compounds (water, methane, and ammonia, mostly).

The sizes of the cores of Jupiter and Saturn are comparable to the size of Earth, maybe even bigger. The cores of Uranus and Neptune are smaller than Earth.

Answer 3

The "solid" core of Jupiter is larger than the earth (it is indeed not rocky, so far as we know. I don't think Saturn has a solid core (it's density is, after all, <0.7 that of water). Neptune and Uranus probably have solid cores, but probably smaller than the Earth. Earth is the largest rocky body in the solar system (as far as we know).

Answer 4

It's really not a rocky inner part. Here's a pretty good write up on them.

http://en.wikipedia.org/wiki/Gas_giant