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If we drive down the cost of transportation in space, we can do great things.

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 pace of progress on Mars depends upon the pace of progress of SpaceX.

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

On one of the SpaceX flights, we had a secret payload: a wheel of cheese. We flew to orbit and brought it back, so it was the world’s first ‘space cheese.’ It was, in part, a tribute to Monty Python.

It is true that SpaceX is partially a government contractor, but it would be unfair to say that SpaceX is entirely a government contractor.

My vision is for a fully reusable rocket transport system between Earth and Mars that is able to re-fuel on Mars – this is very important – so you don’t have to carry the return fuel when you go there.

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

The revolutionary breakthrough will come with rockets that are fully and rapidly reusable. We will never conquer Mars unless we do that. It’ll be too expensive. The American colonies would never have been pioneered if the ships that crossed the ocean hadn’t been reusable.

If you look at our current technology level, something strange has to happen to civilisations, and I mean strange in a bad way. And it could be that there are a whole lot of dead, one-planet civilisations.