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en.wikipedia.org/wiki/Inner_core

The Earth's inner core is the Earth's innermost part. It is primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 70% of the ...

www.livescience.com/29054-earth-core-hotter.html

Apr 25, 2013 ... Earth has multiple layers: the crust, the mantle, the liquid outer core and the solid inner core. ... That's as hot as the surface of the sun.

www.scientificamerican.com/article/why-is-the-earths-core-so

It takes a rather long time for heat to move out of the earth. This occurs through both "convective" transport of heat within the earth's liquid outer core and solid ...

spaceplace.nasa.gov/review/podcasts/transcripts/090302_earths_core.html

Although Earth's center is closer than most of the other objects we muse about at The Space Place, in some ways it is more remote. Its solid core is about the ...

wonderopolis.org/wonder/how-do-we-know-the-temperature-of-earths-core

But how do scientists know how hot Earth's core is? They can't see it. They can't dig down deep enough to use a thermometer to measure its temperature.

www.nationalgeographic.com/science/earth/surface-of-the-earth/earths-interior

Learn about the interior of the Earth. ... Although this inner core is white hot, the pressure is so high the iron cannot melt. The iron isn't pure—scientists believe it ...

www.theatlantic.com/technology/archive/2013/04/the-earths-core-is-as-hot-as-the-surface-of-the-sun/275346

Apr 26, 2013 ... But the sun's surface isn't all that hot, at least compared with its atmosphere.

www.extremetech.com/extreme/154357-earths-core-is-much-hotter-than-previously-thought-hotter-than-the-surface-of-the-sun

Apr 26, 2013 ... This means the core of our Earth is actually hotter than the surface of the Sun. ... The distance to the center of the Earth is 6,371 kilometers (3,958 mi), the crust ... decay - which keeps our planet's interior hot and the earth alive.

www.theverge.com/2013/4/26/4271378/its-getting-hot-in-here-earths-core-is-1000-degrees-warmer-than

Apr 26, 2013 ... The Earth's inner core is hotter than experts previously suspected — by a whopping 1000 degrees. In fact, new research suggests, the center of ...