It's not just that. The difficulties in sending a human to Mars and safely returning him/her are way beyond anything we have ever tried. It wouldn't be that bad to send a human to, say, Phobos, but Mars poses some extra problems, not the least of which is how to land.
An atmosphere too thick for retro rockets and too thin for parachutes is a major impediment.
So until I start seeing progress on those issues, I will see this just as sci-fi.
An atmosphere too thick for retro rockets and too thin for parachutes is a major impediment.
So until I start seeing progress on those issues, I will see this just as sci-fi.