"Mike Scott" wrote in message
...
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.

There are other theories now.

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

There was a programme about it last week on R4.

I remember ZETA well, the problem was containing the temperature.

Mary