Authors:

I suggest that going to Mars means permanence on the planet - a mission by which we are building up a confidence level to become a two-planet species.

Buzz Aldrin, Leonard David (2013). “Mission to Mars: My Vision for Space Exploration”, p.167, National Geographic Books
I suggest that going to Mars means permanence on the planet - a mission by which we are building up a confidence level to become a two-planet species.