What’s more, Mars should not even be a target for colonization at this point, according to Hadfield. Our sites should be set on a place much closer.
“We absolutely need to do it on the moon for a few generations,” Hadfield told Keep.
On average, the moon is about 600 times closer to Earth than Mars. That means if something goes wrong with a colony, we can dispatch help from Earth that will reach the Moon in a matter of hours instead of months. Developing a working moon colony would be an important first step to living on Mars.
Read more: http://www.businessinsider.com/astronauts-thoughts-on-mars-one-colony-mission-2014-12#ixzz3KglUGS77