In a brief history of time i used the word "god" like einstein did as a shorthand for the laws of physics. However, this is not what most people mean by god, so i have decided not to use the term. The laws of physics can explain the universe without the need for a god.
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The whole history of science has been the gradual realization that events do not happen in an arbitrary manner, but that they reflect a certain underlying order, which may or may not be divinely inspired.
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Even if there is only one possible unified theory, it is just a set of rules and equations. What is it that breathes fire into the equations and makes a universe for them to describe?
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If it [the universe] was expanding fairly slowly, the force of gravity would cause it eventually to stop expanding and then to start contracting. However, if it was expanding at more than a certain critical rate, gravity would never be strong enough to stop it, and the universe would continue to expand forever.
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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.
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Think of our dna. In the last million years, our dna hasn't changed at all. It's really much the same as it was in the jungle, a million, two millions years ago. But in the last 200 years, our destructive capacities have increased many, many millions of times over. Why don't we see intelligent signals from outer space? Because in all likelihood, once the civilization reaches the point our civilization has reached, it destroys itself.
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Because imaginary time behaves like another direction in space, histories in imaginary time can be closed surfaces, like the surface of the earth, with no [existential] beginning or end.
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