The Core aside, we can't actually get a ship to burrow into our Earth's inner core; and we can't do it for Uranus either. (Maybe your mom's. ... sorry) So today ScienceDaily offers content for terrestrials-with-magnetics, and for ice giants. Although some of this stuff has been knocking about for awhile.
I'm interested in why Earth gets a core with magic ionic carbon, protecting us (and LEO) from cosmic and solar radiation; but Venus our sister does not. At least Mars has the excuse there's only a tenth the mass such that its core is more predictable... and ineffectual.
As for the "Ice Giants" - that, I was a little more prepared-for. Those "mini neptunes" in other systems are solid rock, or molten rock, with obscurant clouds. There's probably a lot of queer-state liquid silicates below the supercritical ice in actual-Neptune.
We'd like more missions out there, but we'll unfortunately not get them for some time.
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