TL;DR
This paper reviews the historical development of evidence for the Universe's expansion, highlighting key contributions from Lundmark, Lemaître, and Hubble in observational and theoretical contexts.
Contribution
It clarifies the chronological and scientific contributions of Lundmark, Lemaître, and Hubble to the discovery of Universe expansion.
Findings
Lundmark provided early observational evidence.
Lemaître developed the theoretical framework.
Hubble confirmed observational proof.
Abstract
Lundmark established observational evidence that the Universe is expanding. Lema\^itre established theoretical evidence. Hubble established observational proof.
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