1 million in a few centuries seems feasible given the likely advances in technology. Hundreds of millions would require terraforming, which will likely take mil

1 million in a few centuries seems feasible given the likely advances in technology. Hundreds of millions would require terraforming, which will likely take millennia. But those timescales are relatively short if human civilization persists. Even if Mars does not end up being ideal enough, Venus could be on a longer time scale. The article is short sighted.