> Couldn't we just use the same technology to remain on earth? Who is the "we" there? Some of us would indeed choose to remain on earth, while others will choo

> Couldn't we just use the same technology to remain on earth? Who is the "we" there? Some of us would indeed choose to remain on earth, while others will choose to go to Mars. We will colonize Mars not as a collective action of "Earth", but as the sum of many individual actions of people who possess their own free will.