Radioactive Heat Found in Mars' Core by Scientists.

Researchers at ETH Zurich have discovered that the main source of heat inside Mars is the result of radioactive elements like thorium and uranium decaying over time. The team used data obtained by NASA's Mars InSight lander to determine the thickness of the Martian crust, which averages between 26 and 35 miles, much thicker than that of the Earth or the Moon. At least half of the heat-producing radioactive elements were found in the Martian crust, which could account for "local melt zones" in the planet's interior.