I Don't Believe Any Pair

I Don't Think We're Going To Build A 50-person Spacecraft Or A 100-person Spacecraft.

When We Can Demonstrate That We Can Take Off Horizontally And Put Something Into Orbit, Then We Can Begin To Talk About Increasing The Amount Of Payload. But To Say, 'i'm Going To Do That And Put People Into Orbit' Is A Real Leap.

The Way I See It, Commercial Interests Should Manage A Lunar Base While Nasa Gets On With The Really Important Task Of Flying To Mars.

I Still Say, 'shoot For The Moon; You Might Get There.'

We Can't Start Over And Develop A Saturn 5-type Vehicle From Scratch.