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"...might make it to a gas giant’s core. What it would find there in the alien murk is still unclear."

One conjecture is metallic hydrogen.

https://en.m.wikipedia.org/wiki/Metallic_hydrogen

I hate how the article title is not answered in the article.

More and more article titles follow this click bait pattern. The article itself is fine, interesting, albeit a bit short. But I totally agree, and it irks me too, that the implied promise of the title is not honored.

> roydivision SLAMS Popular Science magazine

I'm confused about this. The articles notes how hot the center of Jupiter would be "While our solar system’s gas giants are far from the sun, the core of a gas giant is likely to be incredibly hot–Jupiter’s is estimated at around 43,000 degrees Fahrenheit."

Yet this article notes liquid Hydrogen towards the core and ice in the core. https://en.m.wikipedia.org/wiki/Metallic_hydrogen

The triple point diagram https://www.engineeringtoolbox.com/hydrogen-d_1419.html suggests temperatures in this range would not yield anything solid or liquid.

You also need to consider pressure, not just temperature. The same wikipedia page is talking about dozens to hundreds of gigapascals of pressure.

If you look at your triple point graph, it stops several order of magnitude below.

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