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People who think we know everything about the universe don't know anything. They don't know how complex, even gravity, can be in the universe. We have no idea: how much mass is in the universe, how dense it is, what dark matter and dark energy are and if they even exist, and how will it end or not. We are still recieving new information about our universe; even today something so complex could seem possibly trivial to future generations. That's my two cents. [http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/einstein.html look here for more information] [[User:snakehr3|Jake]] 21:43, 6 September 2007 (UTC)
== Stability ==
Isn't the Einstein static universe unstable? Any small increase in ''a'' will tend to make ''da/dt'' positive, and the universe will then diverge towards infinite expansion. Any small decrease in ''a'' will tend to make ''da/dt'' negative, and drive the universe to collapse. It is like a pencil balanced on its point; with any deviation from the equilibrium point leading to positive feedback and an increasing divergence either for expansion or collapse. ''—[[User:Duae_Quartunciae|Duae Quartunciae]] <small>([[User talk:Duae_Quartunciae|talk]] '''·''' [[Special:Contributions/Duae_Quartunciae|cont]])</small>'' 08:12, 11 September 2007 (UTC)
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