It will be expensive, it will take a lot of energy and a complex spacecraft. But I suspect that even though the various questions are difficult and many, they are not as difficult and many as those we faced when we started the Apollo (space program) in 1961.

Hey, we missed the whole thing.

There are two of them up here.

It's a strange, eerie sensation to fly a lunar landing trajectory not difficult, but somewhat complex and unforgiving.