Is Mars Liquid? Or Is It All Solid?

The dynamo effect that gives you a magnetic field doesn't just come from having liquid sitting around. It comes from currents, right? Ionized particles in motion. So it's possible that mars has a liquid but that liquid isn't flowing in the right way to give you a magnetic field. If you djust like a core of veno seramic or whatever, something that was totally insulating, then you couldn't get a magnetic fuel from that has to conduct electricity. We do think, based on density estimates, that there is a big iron, nickel core to mars.