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RE: 5 Steps To Colonising Mars
it was just very recently discovered that mars has, in some places, liquid flowing water.
http://www.nasa.gov/press-release/nasa-confirms-evidence-that-liquid-water-flows-on-today-s-mars
the problem with low gravity is that there will be significant loss in bone density and muscle atrophy. the rest you can read here:
http://www.philforhumanity.com/Colony_on_the_Moon.html
asteroids are best suited for mining. To be a viable alternative to Earth it needs to at least be half the size of earth because we will quickly want to scale population.
Mars is barely half the size of earth.
http://www.lpi.usra.edu/publications/slidesets/redplanet2/slide_1.html