If future Mars colonizers want to survive without pressure suits, they’ll need to generate a denser atmosphere. One way to achieve this could be to bombard the Red Planet with water-rich asteroids.

One part of this plan would require increasing the planet’s atmospheric pressure, and one scientist suggests that capturing celestial objects from the Kuiper Belt—which are full of the necessary light ...

A partial checklist: Food, water, shelter, air After the Moon, the next logical place for humans to live beyond Earth is Mars ...

Depending on whom you talk to, terraforming could take anywhere ... The lack of gravity may cause humans on Mars to evolve differently than on Earth. Mars has one-third the gravity of Earth ...

As on Earth ... a catastrophic impact on Mars could instigate earthquakes and volcanism. It’s definitely a difficult plan, but then again, no one ever said terraforming Mars would be easy.