JOURNAL ARTICLE

A century of modern cosmology.

  • Published In: Science, 2025, v. 390, n. 6779. P. 1230 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Freedman, Wendy L. 3 of 3

Abstract

In 1925, Edwin Hubble reported the finding of 11 Cepheid variables—a class of radially pulsating stars whose brightness varies over time—in an irregular-shaped celestial object that is named NGC 6822 (NGC; new general catalog of deep sky objects), also known as Barnard's Galaxy (1). This milestone discovery transformed the course of astronomy by enabling a measurement of the distance from Earth to astronomical objects outside the Milky Way (the extragalactic distance). The result vastly expanded the known Universe, initiated the field of modern cosmology, and provided compelling evidence that the Milky Way is not alone, but one of myriad "island universes." Today, Cepheids remain central to measuring extragalactic distances. [ABSTRACT FROM AUTHOR]

Additional Information

  • Source:Science. 2025/12, Vol. 390, Issue 6779, p1230
  • Document Type:Article
  • Subject Area:History
  • Publication Date:2025
  • ISSN:0036-8075
  • DOI:10.1126/science.aec1402
  • Accession Number:190352865
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