re: How long until we have a self sustaining population on another planet?

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DavidtheGnome probably could give a detailed answer. In my opinion, it probably will never happen. Just getting a person to Mars is a colossal challenge and it’d never be self sustaining.

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I'm pretty sure Europe in the 1500's said the same thing about the new world. But humanity found a way....Humanity always finds a way

We actually have much of the technology to live a very difficult life on Mars. It would be disgustingly expensive but it is possible

1. Build a combination Biodome and underground network
2. Nuclear Power combined with Solar and Wind
3. Artificial light
4. Use cloning technology to "grow" the first livestock
5. The challenge is water. We would have to find a source of water large enough to sustain life. Water would need to feed crops and people as well as be used to generate O2 through electrolysis (submarines have been doing this for 60 years)

ETA: The atmosphere is made up of 98% CO2....could we possibly find a way to simulate photosynthesis on a large scale and convert CO2 to O2?