| According to the widely accepted theory of the big bang, the universe originated about 14 billion years ago and has been expanding ever since. Astronomers recognize four models of possible futures for the universe. According to the closed model, many billions of years from now expansion will slow, stop, and the universe will contract back in upon itself. In the flat model, the universe will not collapse upon itself, but expansion will slow and the universe will approach a stable size. According to the open model, the universe will continue expanding forever. In the accelerating expansion model, the universe will expand faster and faster until even the particles in normal matter are torn away from each other. Astronomers currently favor the accelerating expansion model. |
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