2dF Galaxy Redshift Survey

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What Wikipedia says

In astronomy, the 2dF Galaxy Redshift Survey (Two-degree-Field Galaxy Redshift Survey), 2dF or 2dFGRS is a redshift survey conducted by the Australian Astronomical Observatory (AAO) with the 3.9m Anglo-Australian Telescope between 1997 and 11 April 2002. The data from this survey were made public on 30 June 2003.

Excerpt from the Wikipedia article “2dF Galaxy Redshift Survey”, under the CC BY-SA 4.0 license. Read the article on Wikipedia