[doc30]

Drop enough small asteroids on Mars, (and I'm talking a LOT of them!) and increase the mass while building up the gas pressure and temp, all at once... Of course, we probably ought to look the place over rather carefully first, as there isn't much that would survive the "rain" we caused. (Simplistic solutions for simplistic people...)

You are right, not much would survive adding sufficent mass to increase the gravity of Mars. Such mass would add hundreds of kilometers to the diameter of the planet. Nothing original would remain.

[Old Student]

"You are right, not much would survive adding sufficent mass to increase the gravity of Mars. Such mass would add hundreds of kilometers to the diameter of the planet. Nothing original would remain."

Oh, most of it would still be there. In itty-bitty-teensy-weensy pieces, but it would still be there...