Jupiter's awesome. The Hydrogen atmosphere is so dense that it conducts like a metal.

Nothing is known about Jupiter's core. The metallic Hydrogen atmosphere obscures all electromagnetic waves that might be going into or coming out of it. It is assumed that there is a rocky core, implying some surface to the planet, but it is entirely speculative. The extreme gravitational pull makes sending a probe in to record data, then come back out to relay the data laughable. If we could make a probe that withstood the pressure, that is.