The Natural Philosopher wrote:
....
In fact, there is a puzzle, in that the earths actual temperature is
more than can be accounted for by the solar radioation and its initial
temperature post formation, leading to a lot of speculation that it is
in fact a large fission reactor in its own right.

Isn't there a large molten iron core that makes up the difference? Been
there since year dot, or thereabouts, cooling all the time.

But out of curiosity, what happened to all the research into fusion
reactors? Anyone else remember ZETA?


--
Mike Scott (unet at scottsonline.org.uk)
Harlow Essex England