Definition: terraforming

Changing a planet's ecology to sustain human life. Terraforming is necessary if people are able to live on the moon, Mars or some other planet besides earth. Although this seems impossible today, enthusiasts believe it can be done with enough scientific breakthroughs.

Musk Says "Yes"
Elon Musk believes we can terraform Mars and that it is entirely necessary for the survival of the human race. Be sure to reserve your first-class ticket.