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English translation: Fritz Zwicky. Republication of: The redshift of extragalactic nebulae. #GenRelativGravit 41, 207–224 (2009). DOI:10.1007/s10714-008-0707-4 https://t.co/mNZEdT2Nyj Editorial note by Jürgen Ehlers: https://t.co/X8ZkSQ0kqy #redshift #D