The center of the earth lies 6,400 kilometers (4,000 miles) beneath our feet, but the deepest that it has ever been possible to drill to make direct measurements of temperature is just about 10 kilometers. The Earth's outer core is in a state of turbulent convection as the result of radioactive heating and chemical differentiation. This sets up a process that is a bit like a naturally occurring electrical generator, where the convective kinetic energy is converted to electrical and magnetic energy. That led to the conclusion that the temperature of the center of the Earth is about 6000 degrees Celsius a temperature about 9% higher than what exists on the surface of the Sun.
The ball-shaped core lies beneath the cool, brittle crust and the mostly solid mantle. The core is found about 2,900 kilometers (1,802 miles) below Earth's surface, and has a radius of about 3,485 kilometers (2,165 miles). That led to the conclusion that the temperature of the center of the Earth is about 6000 degrees Celsius - a temperature about 9% higher than what exists on the surface of the Sun. The Earth's outer core is in a state of turbulent convection as the result of radioactive heating and chemical differentiation. This sets up a process that is a bit like a naturally occurring electrical generator, where the convective kinetic energy is converted to electrical and magnetic energy. The bottom line here is simply that a large part of the interior of the planet (the outer core) is composed of somewhat impure molten iron alloy. The melting temperature of iron under deep-earth conditions is high, thus providing prima facie evidence that the deep earth is quite hot. According to NASA, lightning is four times hotter than the surface of the sun. The air around a stroke of lightning can peak at 50,000 degrees Fahrenheit, while the surface of the sun is around 11,000 degrees. Meanwhile, magma can reach temperatures near 2,100 degrees. The inner core is the most metal place on Earth even more so than the outer core. Both are made mostly of iron, along with a smattering of nickel. But the iron is thought to also contain traces of lighter elements like oxygen, carbon, and silicon. he mean temperatures of planets in our solar system are: Mercury - 333°F (167°C) Venus - 867°F (464°C) Earth - 59°F (15°C)