User blog comment:PitaKang/Funday Monday 3: What would an interstellar civilization look like?/@comment-665531-20130430220327/@comment-4206034-20130504232626

Mars can go for easy 5 Billion (that large supercontinent, remember?). If Earth was well organised, we could (technically) house around 8 Billion people. Venus, maybe 6 Billion (only has two continents).

The real challenge is not terraforming Mars, but Venus for all the folks out there.