Terraforming Mars is therefore a daunting endeavor that doesn't seem possible with current technology. ... These gases are short-lived, though, so the process would need to be repeated on a large scale to keep Mars warm. Another idea is to import gases by redirecting comets and asteroids to hit Mars.

Why is it impossible to terraforming Mars?

On Mars, the pressure of the atmosphere is less than one percent of the pressure of Earth's atmosphere. Any liquid water on the surface would very quickly evaporate or freeze. ... As a result, terraforming Mars is not possible using present-day technology,” said Jakosky.

What are possible ways to terraform Mars?

Here are three terraforming methods that have been proposed: Large orbital mirrors that will reflect sunlight and heat the Mars surface. Greenhouse gas-producing factories to trap solar radiation. Smashing ammonia-heavy asteroids into the planet to raise the greenhouse gas level.