[bigheadfred]

The theory is that the core of Jupiter could be a diamond the size of Earth.

And the girls have kaleidoscope eyes.

[SunkenCiv]

But what if it aligns with Mars?

The problem with figuring out the core of Jupiter is a total lack of trying on our part. ;’) Eventually someone will try something really smooth, such as a “dark side” neutrino detector, and try to map the core (if there is a core). The average density of Jupiter is somewhat higher than that of Saturn (which has an average density close to that of water), but given its mass (318 times that of Earth) an Earth-sized core is remotely possible, depending on what it’s made of. :’)