[pond_lilly]

Exactly, like bacteria in our guts that gets replenished by consuming foods grown in Earth soil. On Mars this stuff will die out right away, and to replicate it you will need to create another Earth.Gut bacteria is just a tiny example, there is other stuff like bone problems, vision problems, etc. I am appalled that instead of fixing mess here on earth, the only known planet to support life, we waste brains, time and resources on these idiotic fantasies simply because Sagan and deGrasse Tyson are charismatic dudes who can sell a turd if they wanted to to their fan base.