Intellectually Curious

The Theory of a Superionic Core at the Center of the Earth

Mike Breault

What if Earth’s inner core isn’t a simple solid ball of iron at all? In this episode we explore the idea that the core could be in a superionic state—iron lattices that stay solid while carbon atoms flow through them like dancers in a square—making the core both structured and surprisingly soft. We’ll unpack how this explains seismic data, how such a “frozen yet flowing” core could slow seismic waves without melting, and how this dynamic interior powers the geodynamo that shields our planet. Plus, what this could mean for rocky exoplanets and our broader understanding of planetary cores.


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