contains on average some one hundred billion stars. If a star were a grain of salt, you could fit all the stars visible to the naked eye on a teaspoon, but all the stars in the universe would fill a ball more than eight miles wide.

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We are all now connected by the Internet, like neurons in a giant brain.

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One can't prove that God doesn't exist. But science makes God unnecessary. The laws of physics can explain the universe without the need for a creator.

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This means that at earlier times objects would have been closer together. In fact, it seemed that there was a time, about ten or twenty thousand million years ago, when they were all at exactly the same place and when, therefore, the density of the universe was infinite.

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I think the human race has no future if it doesn't go into space.

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Aristarchus suspected that this was the case and believed that the stars we see in the night sky are actually nothing more than distant suns.

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I'm happy if I have added something to our understanding of the universe.

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There is no unique picture of reality.

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We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet.

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The basic assumption of science is scientific determinism.

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