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expanding-universe
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Galaxies recede at speeds proportional to their distance. Einstein had added a cosmological constant to keep his universe static and later dropped it. It returned in 1998 as dark energy.
Evidence tier V3 is the import default for a result the curation records as settled in the published record. No formal proof or certificate is attached to this page yet.
Closed 1929, Edwin Hubble, building on Lemaître (1927) and Slipher's redshifts.