Replies

> It is known that the earth's magnetic field is weakening by half every 1400 years.

Never saw a sine wave, huh? Never saw fluctuations in the stock market, waves on the ocean, noticed the cycles of sunspots? Up-and-down is normal, and often reverses itself on a regualr basis.

> It is also know that the magnetic field is absolutely required to be at certain levels to support life (promote healthy cell interaction/duplication) at all.

Wrong.

> If it is to great nothing can live.

The magnetic field from the monitor in front of you is likely several times stronger than the Earths magnetic field. Critters, humans included, regularly live in magnetic fields *far* more powerful than the Earth's. Frogs have been levitated by magnetic fields with no ill effects.

> If it gets to weak things begin to mutate and die

Everythign dies. And mutation is, on the whole, a good thing as it drives evolution.

> This is only one reason why humans will never survive on planets with weak magnetic fields e.g. the moon, mars or planets with very very strong magnetic fields. It has to be just right.....

I'm sorry, but that's just damned funny. I've been studying manned spaceflight and space colonization for two decades, and never have I seen such silliness. Magnetic fields in and of themselves do not effect organic systems much at all. Go to the hardware store, buy the strongest magnet you can buy and hold it in your hand or tape it to a mouse. The field will do nothing.

"Magnetic fields in and of themselves do not effect organic systems much at all."
Obviously you haven't been reading all that you say you have or you missed something or simply forgot.
The lack of, or over abundance of magnetic fields, do in fact severely effect biological systems. Go read of the effects of long space flight on the astronauts. It is quite sobering and daunting. Use the internet and do a search. The information is out there just go read it.