The Surprising Ways Mars is Hostile to Life

So did she offer any option on how to make Mars habitable short of a planetary shield to protect it from ionizing radiation and prevent the escape of gases? To truly Terraform Mars, we would have do some pretty horrific things to it.  Planetary bombardment  by asteroids from the asteroid belt is what I remember someone suggesting.  This would accomplish several things. It would introduce new metals to the planet, it would increase the mass=gravity to help prevent the loss of gases, trigger a global upheaval and disruption of the surface of the planet's surface.  Volcanic activity might ensue which could lead to greenhouse gas event. The disruption of the surface would allow the new material to sink to the planet's core. With a new increase in mass, then pressure might be sufficient to remolt the cold core and allow a reformation of a magnetic field.  This would take hundreds of years before the surface would settle down enough to allow exploration again.   The downside is we don't know what this would do to the Earth's rotation or what effects it would have on the Earth itself. Too many unanswered questions to risk all life here just on the off chance of bringing back a dead world.