Gary, I was astounded by Rothenberg's statements as to the severity of the problem -

That's his analysis of the manned Mars radiation problem, not mine - and this is the second time he has spoken about it -

I am not particularly concerned about radiation, as for manned Moon flight the danger is minimal: the flight times are short; shelters are possible; and in the worst case you can abort to the safety of the Earth's magnetic field -

With solutions around, I haven't given radiation much thought - I can't even remember what I used to know about radiation in space -

The radiation problem is yours - you want manned Mars flight, you want colonization, you solve it -

The only thing I'll add is that in the end, Mars still won't have much of a magnetic field -

EP