Mars is usually named as humanity's most likely second home, but a NASA-funded study concluded it cannot be terraformed with present technology, and until that changes, living there would mean sealing yourself against near-vacuum, deep cold and st - Space Daily

Mars is usually named as humanity's most likely second home, but a NASA-funded study concluded it cannot be terraformed with present technology, and until that changes, living there would mean sealing yourself against near-vacuum, deep cold and st Space Daily Terraforming Mars: How Visionaries Plan to Create a Second Earth RealClearMarkets