satellite galaxies 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
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