"The more we got into it - by year two out of the four-year research process, we were like, OK, there's a lot of stuff we don't know that we still need to figure out. And if we do this soon, it could be an ethical catastrophe."
"No way that you could scale up to a million people on Mars without something catastrophic happening, either in terms of it turns out we can't have babies up there, and moms and babies are dying or getting cancer."
"If you want to do this, it's got to be the slow work of generations to build up to a point where we could be self-sustaining on Mars."
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