The galaxy cluster Abell 2029, located about 1 billion light-years from Earth, was thought to be the most relaxed cluster in the universe.
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'Calm' galaxy cluster hides a violent cosmic scene that took 4 billion years to settle
1 Billion Light-Years Cluster distance
2 Million Light-Years Sloshing spiral length
4 Billion Years Collision age
10x Smaller Cluster Mass ratio