Earth's Core Is as Hot as the Sun's Surface

The inner core, a solid ball of iron and nickel, reaches temperatures of about 9,940 degrees Fahrenheit (5,500 degrees Celsius). This immense heat is generated by residual energy from planetary formation and ongoing radioactive decay.

Source

https://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-earth-s-core-58.html

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Published: March 29, 2026
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Earth Earth Science Geology Earth Core Temperature Sun Inner Earth

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