@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[0], to place it there, to operate it, and to keep it in position long enough be cost effective?
::crickets:: ... That's what I thought.
[0] The engineering of a technology that doesn't as yet exist, of course.