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I don't think the human race will survive the next thousand years, unless we spread into space.

Look how far the human race has come in terms of air and space travel in the last hundred years. So in the next couple of thousand years, you've got to believe that we're going to be able to do all kinds of amazing things.

It's not going to be just humans colonizing space, it's going to be life moving out from the Earth, moving it into its kingdom. And the kingdom of life, of course, is going to be the universe.

The question that will decide our destiny is not whether we shall expand into space. It is: shall we be one species or a million? A million species will not exhaust the ecological niches that are awaiting the arrival of intelligence.

There's going to be space travel at some point.

With every inch of land on Earth now catalogued by our satellites, the stars are the next place we as a species must travel. And with a booming world population that will hit 9.1 billion in 2050, large-scale space travel may become a necessity.

I think humans will reach Mars, and I would like to see it happen in my lifetime.

I believe, I truly believe, that humans will be living off of this planet, at some point in the future. It's inevitable for us, and it seems like a reasonable and realistic progression for us as a human race. We won't last on this planet - not forever.

I think we have a good chance of surviving long enough to colonize the solar system.

The planet will survive. Whether we get to be here and enjoy it, or enjoy life as we've known it, is what's questionable.