[Centurion2000]

Just exactly how would that change man?

We'd have permanent colonies across the solar system in 20 years.

There would be a HUGE push to 'spread the seed of man'

[BenLurkin]

We will not be able to colonize space until we develop an entirely self-contained environment (one which starts with a limited amount of air, food and water and recycles them over and over and over again - automatically.)