Source: Science Daily
quote: One would hope that if enough mass is added to Deimos, the core of Mars would unlock due to tidal stress induced heat. Maybe Mars could be habitable with a magnetosphere.
quote: There are moons with thick atmospheres so it is not gravity. I would say gravity does play a role but a small one.
quote: The team studied meteorites from Mars and rocks found by NASA's Spirit rover on Mars' surface. They found that the surface rocks were five times richer in nickel than the meteorites.