It wasn't until maybe a year before we were done writing — and we wrote for four years — that we decided this book is actually about why space settlements aren't coming soon.
All of the tech we’d need to even get to mars would be sufficient to sustain human life in space
Yes, we could sustain human life in space for a while, as we do during the trip to Mars, but the problem is that supplies (especially food and oxygen, and probably water) will eventually run out and have to be replenished.
In outer space, there’s a vacuum and so, materials can’t be sourced from there. They have to be sourced from a planet or another object that provides a large supply of materials. Mars offers atmospheric CO2 and water (in the form of hydrated rocks), which can be used to produce biomass (food) and oxygen (through electrolysis). So it’s preferable to just floating in outer space.
It’s not entirely the case.
Yes, we could sustain human life in space for a while, as we do during the trip to Mars, but the problem is that supplies (especially food and oxygen, and probably water) will eventually run out and have to be replenished.
In outer space, there’s a vacuum and so, materials can’t be sourced from there. They have to be sourced from a planet or another object that provides a large supply of materials. Mars offers atmospheric CO2 and water (in the form of hydrated rocks), which can be used to produce biomass (food) and oxygen (through electrolysis). So it’s preferable to just floating in outer space.
Which is why I think we should skip Mars and head straight for the asteroid belt. Plenty of resources, no toxic dust.