I think there is a strong humanitarian argument for making life multi-planetary in order to safeguard the existence of humanity in the event that something catastrophic were to happen.

I know Elon, we're very like minded in many ways. We're not conceptual twins. One thing I want us to do is go to Mars, but for me it's one thing. He's singularly focused on that. I think motivation wise, for me I don't find that Plan B idea motivating. I don't want a plan B for Earth, I want Plan B to make sure Plan A works.

If anyone has a vested interest in space solar power, it would have to be me.

If humanity doesn't land on Mars in my lifetime, I would be very disappointed.

The space shuttle was often used as an example of why you shouldn't even attempt to make something reusable. But one failed experiment does not invalidate the greater goal. If that was the case, we'd never have had the light bulb.

Land on Mars, a round-trip ticket - half a million dollars. It can be done.