There is no room to screw up on a trip like this, mental or otherwise.
Once on Mars, you are likely to be stuck there for a year or more,
waiting for a window of opportunity to ride home.
And unlike a robot, the hopes and fears of the whole planet will be riding with you.
I think a human is gonna do a better job of exploring Mars ultimately than robots ever can.
Robots move really slowly.
Okey, what's bearing up opportunity have done in five years on Mars two astronauts could probably have done in a week.
As fast and smart as we are,
we still need mechanical help to sculp the course for Mars.
The next robot rolling on to red dirt will be ably named Curiosity.