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==Trattazione semplificata dell'origine dell'universo==
Secondo la '''Legge di Hubble''', scoperta da [[Edwin Hubble]] nel [[1929]],<ref>Hubble, Edwin, "[http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1929PNAS...15..168H&db_key=AST&data_type=HTML&format=&high=42ca922c9c30954 A Relation between Distance and Radial Velocity among Extra-Galactic Nebulae]" (1929) ''Proceedings of the National Academy of Sciences of the United States of America'', Volume 15, March 15, 1929: Issue 3, pp. 168-173, communicated January 17, 1929 ([http://www.pnas.org/cgi/reprint/15/3/168 Full article], PDF)</ref>
:<math>z = \frac{H_0 D}{c}</math>
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