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galaxy clusters

Galaxies that are pulled into a giant galaxy cluster. When entering the group, these galaxies show a blue shift compared to the central galaxy. Credit: Dr. Shihong Liu

"Challenges of the age of the universe: Galactic dance reveals that the universe may be younger than thought

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Motions of satellite galaxies around groups and clusters of giant galaxies could provide valuable insights into their evolution. The observations of such motion provide crucial clues about the age of the universe
A composite image of the galaxy cluster XLSSC 122 using images from the Hubble Space Telescope and the European Observatory's Very Large Telescope. The white outlines reveal strong X-ray emission observed by the European Space Agency's Multi-Mirror satellite. (John Willis) . Courtesy of the author

New clues in the search for the oldest galaxies in the universe

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