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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.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.smithsonianmag.com/smart-news/the-center-of-the-earth-is-as-hot-as-the-sun-43631207

Apr 26, 2013 ... 1800 degrees warmer than we previously thought, the Earth's core is super hot.

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.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 ... decay - which keeps our planet's interior hot and the earth alive.