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21-Jul-2017 12:37

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 understood as having a physical significance in the usual sense, but it is convenient to quote times measured "since the Big Bang" even though they do not correspond to a physically measurable time.

A tree's growth rate changes in a predictable pattern throughout the year in response to seasonal climate changes, resulting in visible growth rings.

New growth in trees occurs in a layer of cells near the bark.

Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.