Check Out Eons: https://tinyurl.com/2srsyb69 And the full PBS Earth Month Playlist: https://tinyurl.com/ebkf6kx3



Is Earth’s core a solid or a liquid? Yes. The mysteries of our own planet’s interior have, in many ways, been harder to crack than those of the rest of the cosmos. We can send probes to the edge of the solar system, and the 42 billion light years to the...