I don't think people understand just how un-feasible life on Mars would be. It's got 1% of the atmospheric pressure as Earth. It's -65 degrees Celsius. It'd be more feasible to try colonizing the Moon or Antarctica.
Don’t forget the radiation.
> It'd be more feasible to try colonizing the Moon
And just as useless.
We have permanent presence in Antarctica. Depends on your exact definition of "colony", but a narrow definition of it is barred by international treaty, I think.
Moon is definitely a great first step. I originally said "other heavenly bodies".
You sound like someone in 1900 saying "We can't fly, we're too heavy" or "We can't be in space it's got 0% atmospheric pressure".