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.

In order for us to have a future that's exciting and inspiring, it has to be one where we're a space-bearing civilization.

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

The extension of life beyond Earth is the most important thing we can do as a species.

When we got Tesla going at the very beginning, if you asked me what I thought the odds of success were, I would have said less than 50%. I would have said that failure is the most likely outcome.

When you struggle with a problem, that's when you understand it.

I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.