Age of the universe

http://en.wikipedia.org/wiki/Age_of_universe

The age of the universe is the time elapsed between the Big Bang and the present day. Current theory and observations suggest that the universe is between 13.5 and 14 billion years old.^[1]

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The Lambda-CDM concordance model describes the evolution of the universe from a very uniform, hot, dense primordial state to its present state over a span of about 13.75 billion years of cosmological time. This model is well understood theoretically and strongly supported by recent high-precision astronomical observations such as WMAP. In contrast, theories of the origin of the primordial state remain very speculative. If one extrapolates the Lambda-CDM model backward from the earliest well-understood state, it quickly (within a small fraction of a second) reaches a singularity called the "Big Bang singularity." This singularity is not considered to have any physical significance, but it is convenient to quote times measured "since the Big Bang," even though they do not correspond to a physically measurable time. For example, "10⁻⁶ second after the Big Bang" is a well-defined era in the universe's evolution. In one sense it would be more meaningful to refer to the same era as "13.7 billion years minus 10⁻⁶ seconds ago,"

http://da.wikipedia.org/wiki/Universets_alder

I den fysiske kosmologi er Big Bang den videnskabelige teori, ifølge hvilken universet dukkede frem fra en tilstand af helt enorm høj tæthed og temperatur for omkring 13,7 milliarder år siden. ...

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Sent: Friday, February 12, 2010, CET 13:27, GMT 12:27

Subject: Universet er 20 mio. år ældre end vi troede (nu 13,75 mia. år)

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