I just want to retire before I go senile because if I don't retire before I go senile, then I'll do more damage than good at that point.

It would take six months to get to Mars if you go there slowly, with optimal energy cost. Then it would take eighteen months for the planets to realign. Then it would take six months to get back, though I can see getting the travel time down to three months pretty quickly if America has the will.

I would like to fly in space. Absolutely. That would be cool. I used to just do personally risky things, but now I've got kids and responsibilities, so I can't be my own test pilot. That wouldn't be a good idea. But I definitely want to fly as soon as it's a sensible thing to do.

We have a strict 'no a-hole policy' at SpaceX. And we fire people they are. I mean, we give them a little bit of warning. But if they continue to be an a-hole, then they're fired.

It's important that we attempt to extend life beyond Earth now. It is the first time in the four billion-year history of Earth that it's been possible, and that window could be open for a long time - hopefully it is - or it could be open for a short time. We should err on the side of caution and do something now.

The United States is definitely ahead in culture of innovation. If someone wants to accomplish great things, there is no better place than the U.S.

Work like hell. I mean you just have to put in 80 to 100 hour weeks every week. [This] improves the odds of success. If other people are putting in 40 hour work weeks and you’re putting in 100 hour work weeks, then even if you’re doing the same thing you know that you will achieve in 4 months what it takes them a year to achieve.