Temperatures Inside Mars: Is the core liquid or solid?

If internal heating in the mantle of Mars is similar to that in the Earth, solid‐state convection is the mechanism preventing large scale melting of the Martian mantle. Convection is efficient enough in transporting heat to preclude the existence of a liquid core and hence a dynamo driven intrinsic magnetic field, if the viscosity of mantle material is lower than 1022‐1023 cm²/sec at temperatures in excess of about 1500°C. The Martian lithosphere is probably several hundred kilometers thick, intermediate in size between that of the Earth and Moon.