Going to Mars is relatively easy compared to setting up a self-sustaining human civilization on Mars, which will be thousands of times harder. Many people don'

Going to Mars is relatively easy compared to setting up a self-sustaining human civilization on Mars, which will be thousands of times harder. Many people don't understand the scale and scope of the biosphere services the Earth provides to humans free of charge, though, and forget that little of that exists on Mars, other than gravity.