re: NASA's Juno craft beams back stunning pics of Jupiter.

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it still doesn't look like pictures we've seen before

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That's because these were the very first images ever of the south pole. Plenty of cyclones there too. The atmosphere is loaded with storms wherever you look. Good stuff.

This is somewhat off topic, but the fact that there is frozen water on Mercury amazes me

Thanks for the link. The amount of water in the solar system is unreal. Most of it is in a solid state but as our most valuable resource it's good to know it's almost everywhere we look.

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Scientists have generally thought that Jupiter either harbors a relatively compact core 1 to 10 times as massive as Earth or no core at all, said Juno principal investigator Scott Bolton, who's based at the Southwest Research Institute in San Antonio.

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I rather doubt that Jupiter has no core. It would depend on where Jupiter's position was when the solar system formed but since its birth the planet has accreted mass by using its tremendous gravity to draw in other bodies. As with earth's formation, the heavier elements will have sunk to the core and as evidenced by Jupiter's strong magnetic field there's plenty of metal down there.

The cartoon below shows a lot of metallic hydrogen, and that's to be expected, but our solar system formed from the remains of third-generation stars that were rich in all of the heavy elements. Therefore, while there might not be a core of rock, the heavier metals such as iron and nickel are most likely under the metallic hydrogen.