"The happiness of this world is something we cannot keep; it is just like the horizon - the nearer you go, the farther it goes. As soon as you get it, you see it is not the thing you wanted."

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I think the human race doesn't have a future if we don't go into space. We need to expand our horizons beyond planet Earth if we are to have a long-term future. We cannot remain looking inward at ourselves on a small and increasingly polluted and overcrowded planet. We need to look outward to the wider universe.

— Stephen Hawking