For example, hot dark matter would not have been considered non-standard in 1990, but would be in 2010. Because the term depends on the prevailing consensus, the meaning of the term changes over time. The term non-standard is applied to any theory that does not conform to the scientific consensus. A non-standard cosmology is any physical cosmological model of the universe that was, or still is, proposed as an alternative to the then-current standard model of cosmology.
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