"Rocket scientists agree that we have about reached the limit of our ability to travel in space using chemical rockets. To achieve anything near the speed of light we will need a new energy source and a new propellant. Nuclear fission is not an option."

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The physical fabric of the world had to be such as to enable that ten billion year preliminary evolution to produce the raw materials of life. Without it there would not have been the chemical materials to allow life to evolve here on earth.

— John Polkinghorne