We might be able to make Mars habitable

A group of scientists have devised a plan to make Mars a little more hospitable to human life.
A computer modeling experiment suggests that we can use a spacecraft to create a magnetic field around Mars, shielding it from the solar wind that's stripping its thin atmosphere away, oxygen ion by oxygen ion.
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If the plan works — and that's a big "if," it could melt the red planet's polar ice caps to bring back some liquid water to