At the core of the earth, the temperature is estimated to be around

The temperature at Earth's core is estimated to be approximately 5,430°C, similar to the surface of the Sun. This extreme heat is primarily due to: (1) residual heat from Earth's formation (accretion and differentiation), (2) heat from radioactive decay of elements like uranium, thorium, and potassium, and (3) latent heat from solidification of the inner core.