Perhaps you're thinking of this thread? https://www.reddit.com/r/space/comments/2xvdow/why_worry_about_colonizing_mars_when_weve_barely/ https://www.reddit.com/

Perhaps you're thinking of this thread? https://www.reddit.com/r/space/comments/2xvdow/why_worry_about_colonizing_mars_when_weve_barely/ https://www.reddit.com/r/space/comments/2xvdow/why_worry_abo...