@Brian Miller 1 (was: Re: Might it be an opportunity?)
"Surely it doesn't have to be that strong or large if it were placed in the correct place between the sun and mars, like a small magnetic lens"
I suppose one could put a large enough object at L1 in the Sun-Mars system to do what you suggest. Care to guesstimate the energy costs to do the engineering, to place it there, to operate it, and to keep it in position long enough be cost effective?
::crickets:: ... That's what I thought.
 The engineering of a technology that doesn't as yet exist, of course.