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Observational constraints on theories
Choosing among these rival scenarios is done by 'weighing' the universe, for example, measuring the relative contributions of matter, radiation, dark matter and dark energy to the critical density. More concretely, competing scenarios are evaluated against data on galaxy clustering and distant supernovae, and on the anisotropies in the Cosmic Microwave Background.
For more details click on the links in the above:
Ref: http://en.wikipedia.org/wiki/Ultimate_fate_of_the_universe
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