dsgrue3 said:
"Because if you add up the total energy of a flat universe, the result is precisely zero. How can this be? When you include the effects of gravity, energy comes in two forms. Mass corresponds to positive energy, but the gravitational attraction between massive objects can correspond to negative energy. If the positive energy and the negative gravitational energy of the universe cancel out, we end up in a flat universe. Think about it: If our universe arose spontaneously from nothing at all, one might predict that its total energy should be zero. And when we measure the total energy of the universe, which could have been anything, the answer turns out to be the only one consistent with this possibility." http://online.wsj.com/article/SB10001424052748703946504575469653720549936.html
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That's where I thought you got it from, and though I gave a horrible shotput example, the universe wouldn't be nothing if the newtonian gravitational energy is zero, it would still contain enormous amount of dark matter, stars, planets, dust etc. In other words, the universe wouldn't reduce to nothing.
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