[TeMPOraL]

> We have concrete prof that earth is somewhat round and solid but some people still believe that there is a micro sun inside

Wait, isn't the Earth's core molten and hot? Or do people believe the Earth is hollow and has a small star inside?

[mryingster]

https://en.wikipedia.org/wiki/Hollow_Earth

I'm shocked that anyone actually believes this in modern days, but it's a fun thing to fantasize about.

There is a fictional series about hollow earth called Pellucidar by Edgar Rice Burroughs that I enjoyed immensely. A fun read, not unlike Tarzan.

[kaybe]

The center is thought to be solid. It consists of iron and about 10% lighter elements, probably mostly nickel.

There is even a paper that states it is crystallizing at a rate of about 1 mm/year, and this process contributes some of the heat. [1] I have been trying to dig back to the data on this in the past, but haven't found anything but the claim itself.

[1] http://www.nature.com/ngeo/journal/v4/n4/abs/ngeo1083.html

[leojg]

as @mryingster says, I was referring to the hollow earth "theory"