[laweijfmvo]

The video being discussed in this thread started off with a rather contentious claim about the Earth being a giant fission reactor that was heavily debated in the comments. I’m not knowledgeable about the subject at all, but it certainly made me double take (and even open the comments!) and seems to be overstated at best.

[kragen]

The Earth definitely does not produce much heat in its core. Most heat produced in the Earth by fission is produced in the crust. Whether that amounts to "being a giant fission reactor" is a question of semantics; it's like an RTG, but doesn't sustain chain reactions.