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The Earth's inner core is the innermost geologic layer of planet Earth. It is primarily a solidball with a radius of about 1,220 km (760 mi), which is about 20% of Earth's radius or 70% of the Moon's radius.[1][2] The inner core is believed to be composed of an iron–nickel alloy with some other elements. The temperature at the inner core's surface is estimated to be approximately 5,700 K (5,430 °C; 9,800 °F), which is about the temperature at the surface of the Sun.
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The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
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