This in and of itself is a gargantuan task. To make the planet livable, we would need to get that atmosphere back.
It’s too small to generate a magnetic field like the Earth does, so over the years the Sun has blown away its atmosphere, leaving it exposed to radiation and freezing cold temperatures. One of the biggest problems with living on Mars currently is the fact that the red planet has very little atmosphere. The goal is to create a place where life can continue on relatively normally.
This doesn’t necessarily mean we need the ability to recreate Earth and society as we know it, but it doesn’t include living in space suits. It involves assessing the current livability of a planet (in Mars’ case, zero) and evaluating what is needed to make it suitable for life. Terraforming is altering a planet to make it suitable for Earth’s animal life, including humans. Before you can start terraforming, you need to know what it means.
