And if we're talking about self-sustaining Mars colonies, we're talking about something that's relatively far off in the future. If we talk about terraforming

And if we're talking about self-sustaining Mars colonies, we're talking about something that's relatively far off in the future. If we talk about terraforming, we're talking about something much, much further off. It's worth considering the potential future that a Mars colony would exist in. For example, it doesn't seem impossible that we'll have something like brain uploads in the next 200 years. When that happens, what's the point of trying to keep human bodies alive on Mars? It would make about as much sense as trying to use horses to ship freight across the U.S.