merging galaxies

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
Some of the thousands of merging galaxies identified in the Gamma Survey. Photo: Simon Driver and Aron Robotham, ICRAR.

Monster galaxies gain mass by accreting their smaller neighbors

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The quasar pair SDSS_J1254+0846

A merging of galaxies creates a binary quasar

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