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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 ...

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 ...

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 ...

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.

phys.org/news/2006-03-probing-earth-core.html

Mar 30, 2006 ... Although we crust-dwellers walk on nice cool ground, underneath our feet the Earth is a pretty hot place. Enough heat emanates from 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.realclearscience.com/blog/2013/05/How-Hot-is-Earths-Core.html

May 1, 2013 ... What's the center of the Earth like? Well, you can't point a telescope at it, and you can't quite dig down and take a picture. If our planet were a ...

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 ... Why is a revised temperature of the Earth's core important? ... Thank God for radioactive decay - which keeps our planet's interior hot and the earth alive.

www.bbc.com/news/science-environment-22297915

Apr 26, 2013 ... Researchers revisit measurements to determine the temperature of the Earth's core, finding it to be 6000C - as hot as the surface of the Sun.