https://www.spacedaily.com/reports/Astronomers_propose_novel_method_of_measuring_galaxy_distances_999.html
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6/21/23 at 8:21am
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Space Daily
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Beijing, China (SPX) Jun 21, 2023 -
Our Universe consists of hundreds of billions of galaxies, and for nearby galaxies, distances are mainly measured by classical Cepheids and RR Lyrae (RR Lyr) stars.
RR Lyr stars are pulsating
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